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Old 04-12-2012, 11:34 AM   #1
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2001 3.8 gas milage?

Have a 2001 3.8 and wondering what you guys are getting for gass milage?? I don't get on it too much and drive 55-65 not a lot of In town I have a CAI and 245/45 r17. I get about 23 anything I can do to help that because I hear people with 4.6's getting like 29.
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Old 04-12-2012, 11:40 AM   #2
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Seems about right for my city driving, i get 23/24 city. Try changing spark plugs/wires, maybe an aftermarket coil pack. I too have a CAI, and dont drive to hard. But i dont do much highway driving.
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Old 04-12-2012, 11:43 AM   #3
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Quote:
Originally Posted by PonyBoyV6
Seems about right for my city driving, i get 23/24 city. Try changing spark plugs/wires, maybe an aftermarket coil pack. I too have a CAI, and dont drive to hard. But i dont do much highway driving.
I live in a town with like 400 people there is no city I don't drive around a lot as that what my 5.0 is for so idk why it sucks
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Old 04-12-2012, 11:44 AM   #4
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Re: 2001 3.8 gas milage?

city and stop and go hurt mileage a ton, no 4.6 mustang will get 29mpg doing that. My 12 v6 gets 23-24 with 50/50 driving (city/highway) but on the highway it gets 29
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Old 04-12-2012, 11:46 AM   #5
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My last highway trip last week I got 29.3 with cruise set at 75mph. 93 race tune, non ethonol gas, catless dual exhaust, 255 45 17r's, and a cai. I got my 03 3.8 with 60k on it, have 80 on it now. It has new motorcraft plugs and gets seafoamed once every other month, with oil changes every 3000k with full synthetics. I also just flushed the cooling system. I put a new Rad in it a year ago, so I'm going to stick with flushing the cooling system once a year. I also did the rear end lube, and tranny.

If you keep up with regular maintaince and with a few bolt ons, def a tuner, its easy to get great mpgs out of the 3.8.

---------- Post added at 12:46 PM ---------- Previous post was at 12:45 PM ----------

City I'm about 24mpg if I lay off the heavy foot.
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Old 04-12-2012, 12:19 PM   #6
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Re: 2001 3.8 gas milage?

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city and stop and go hurt mileage a ton, no 4.6 mustang will get 29mpg doing that. My 12 v6 gets 23-24 with 50/50 driving (city/highway) but on the highway it gets 29
i seen a thread a while back in tbird forum... 4.6 guys were sayn they were seeing 29 hwy, and the 3.8 guys were seeing 24-25 hwy. it was a very interesting and somewhat heated thread..lol. 3.8 guys were very pissed.
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Old 04-12-2012, 12:35 PM   #7
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Quote:
Originally Posted by Project Pony
My last highway trip last week I got 29.3 with cruise set at 75mph. 93 race tune, non ethonol gas, catless dual exhaust, 255 45 17r's, and a cai. I got my 03 3.8 with 60k on it, have 80 on it now. It has new motorcraft plugs and gets seafoamed once every other month, with oil changes every 3000k with full synthetics. I also just flushed the cooling system. I put a new Rad in it a year ago, so I'm going to stick with flushing the cooling system once a year. I also did the rear end lube, and tranny.

If you keep up with regular maintaince and with a few bolt ons, def a tuner, its easy to get great mpgs out of the 3.8.

---------- Post added at 12:46 PM ---------- Previous post was at 12:45 PM ----------

City I'm about 24mpg if I lay off the heavy foot.
I do keep it tuned up. And clean and all that does gas type make a diff. 3.8 sound okay with no cats?
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Old 04-12-2012, 12:52 PM   #8
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I get about 20-30 miles more to a tank using non ethonal fuel. Its more expensive, about 20-25 cents more per gallon, and few gas stations carry it. You'll have to look around. Its better for your engine too.

As for the cats, with them off it sounds 100 times better than stock at idle and up to 2500rpm, much louder too. But after 2500rpm it sounds 100 times worse than a honda.
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Old 04-12-2012, 01:14 PM   #9
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Originally Posted by Project Pony
I get about 20-30 miles more to a tank using non ethonal fuel. Its more expensive, about 20-25 cents more per gallon, and few gas stations carry it. You'll have to look around. Its better for your engine too.

As for the cats, with them off it sounds 100 times better than stock at idle and up to 2500rpm, much louder too. But after 2500rpm it sounds 100 times worse than a honda.
Non ethonal in Nebraska is almost always exactly 10 cents more. And almost everyone's carrys it.
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Old 04-12-2012, 01:26 PM   #10
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That works out, here there are two or three within a 50 mile radius so not many options. I just filled it up at 4.01 a gallon for 93 non eth, 10% is 3.78 at the same station.
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Old 04-12-2012, 01:31 PM   #11
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I only get 15 mpg n I'm a pizza delivery boy D: i almost always shift under 2,000, have a CAI, just put new pre o2 sensors, they helped a little, before the sensors i was getting like 12 mpg but I also have that missing cat disease that so many of us sixers suffer from...help me!!!
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Old 04-12-2012, 01:34 PM   #12
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I have both cats and mine isn't too bad I get 25-26 average mpg
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Old 04-12-2012, 01:36 PM   #13
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Should I cut my other one out?
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Old 04-12-2012, 01:44 PM   #14
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Remember you do a lot of quick speed changes will make your fads drop look into what tire size and pressure u are running. Look into your header they may have some leak
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Old 04-12-2012, 01:49 PM   #15
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Quote:
Originally Posted by kickerofdoom
Remember you do a lot of quick speed changes will make your fads drop look into what tire size and pressure u are running. Look into your header they may have some leak
Tires 245/45/17 and the should be good I will check.
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Old 04-12-2012, 01:58 PM   #16
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Re: 2001 3.8 gas milage?

i wonder why the 2011+ manuals get worse than the autos by 2mpg, what the real difference is there.... it has to be a lower final drive~
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Old 04-12-2012, 02:44 PM   #17
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So no advise for me....
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Old 04-12-2012, 04:37 PM   #18
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Install high flow cats. I would also do an 87 street tune. That'll help with a couple MPG. Bit driving style and terrain makes the biggest difference

---------- Post added at 05:37 PM ---------- Previous post was at 05:36 PM ----------

Quote:
Originally Posted by Project Pony
Install high flow cats. I would also do an 87 street tune. That'll help with a couple MPG. Bit driving style and terrain makes the biggest difference
And try shifting just above 2k
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Old 04-12-2012, 04:48 PM   #19
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With my almost stock 99, bbk headers is all we have on there for now, I can count on hitting 70 miles at 3/4 tank, 140 at half tank, and 210 at 1/4 tank. It's so consistent it's creepy. Tuner shows up on the 18th, and the flow 44s should be here before that. I'm anxious to see the difference.
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Old 04-13-2012, 05:08 PM   #20
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Re: 2001 3.8 gas milage?

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i seen a thread a while back in tbird forum... 4.6 guys were sayn they were seeing 29 hwy, and the 3.8 guys were seeing 24-25 hwy. it was a very interesting and somewhat heated thread..lol. 3.8 guys were very pissed.
There's no effin way those pos thunderbird 4.6's were getting anywhere near 29mpg...2 different kids at my high school had them both with the v8 and they were lucky to pull 12mpg on the highway, and they were slow as d*ck...

One of them stopped driving the car when gas hit +3.00/gal (2006), he got a ride to school with is daddy

I told him that's why I got a v6

If you see 23-27mpg with your 3.8 then you're doing good...the 99-04 v6's don't consistently see 29mpg...and the 99-04 4.6L's sure as hell don't see high 20's either. Every car is different..some will see better mpg's than others, just the way it is.

As said, regular maintenance and care will keep the car running its best. An 87 street tune will probably help improve mpgs, but don't buy a tuner just for gas mileage increases...obviously spending $379 doesn't justify gaining 2mpg lol.
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Old 04-13-2012, 05:19 PM   #21
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So what could I do? Plugs? Fuel stabilizer? Anything?
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Old 04-13-2012, 05:26 PM   #22
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Plugs, plug wires and a coil will makes sure your spark is big and bright as ever. Get the most free flowing exhaust you can. The little stuff is get mid grade gas if you don't have a tuner, fill you tires to at least 35 psi to help with rolling resistance, keep your air filter clean and keep as much unnecessary things(dead weight) outta your car. Also shift at 2000-2500 that will help with fuel consumption, it did for me.
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Old 04-13-2012, 05:52 PM   #23
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I do all that except for mid grade and exhaust, and I have a CAI n still only get like 15 mpg. I'm missing a first cat on one side, so I'm gonna take the other one out to see if it helps...
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Old 04-13-2012, 06:06 PM   #24
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Rip out your other cat and try that. If not throw your stock intake and a fresh filter on it and try that. I get like 18 around town in mine so you should get atleast that.
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Old 04-13-2012, 06:18 PM   #25
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Re: 2001 3.8 gas milage?

Using any grade other than 87 is pointless unless you're tuned.

Depending on your miles and condition you may want to replace your fuel filter. Not an overly difficult part to replace, just plan on getting some gas in your face lol.

The missing cat will mess with your exhaust flow and could be causing some loss in mileage...either replace the missing cat or take them off, but remember the car will be a lot louder (and more annoying) and will not be emissions legal without cats.
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Old 04-13-2012, 06:40 PM   #26
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I live in ft lauderdale, no emissions for mee so I'm gonna try the cat, I want more exhaust noise to. I like how it sounds, just to quiet, only thing I HATE about our sixers is engine compartment noise -__- sounds horrible. And I only run 87, the rest is pointless unless you have a tune or a expensive sports car lol
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Old 04-13-2012, 09:07 PM   #27
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Re: 2001 3.8 gas milage?

my 01 V6 5 spd started out getting 14/24 on stock 15" wheels/tires before I started adding things...

Tuner bumped me to 20/26 on 91P tune
Windstar / Screamin Demon coil installed same day bumped me to 24/30 (@65 mph)
shorty headers, catted X, and catback changed it to 22/32 (@ 65 mph) I lost city mpg but gained on the highway.

Best mpg was 600 mile trip in Minnesota on 55 mph roads, I averaged almost 35 mpg on that wonderful day !! (may have been almost 36 mpg, I can't recall)

Kinda concerned about what swapping to 17X8 Bullitts w/ 245/45-17 will do to my MPG
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Old 04-13-2012, 11:47 PM   #28
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Good to know, just_john. Now I have a list and gains to compare.
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Old 04-16-2012, 07:26 PM   #29
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So I just got 211 miles to my last tank, figured it out at the pump and I'm only getting 15 mpg, not good, I'm runnin good, no codes, cold air intake, but missing a cat on one side, could that Realy be making me lose 5+ mpgs???

---------- Post added at 08:26 PM ---------- Previous post was at 08:25 PM ----------

Oh yea, I have 18s does that matter?
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Old 04-16-2012, 08:56 PM   #30
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Quote:
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So I just got 211 miles to my last tank, figured it out at the pump and I'm only getting 15 mpg, not good, I'm runnin good, no codes, cold air intake, but missing a cat on one side, could that Realy be making me lose 5+ mpgs???

---------- Post added at 08:26 PM ---------- Previous post was at 08:25 PM ----------

Oh yea, I have 18s does that matter?
I got horrible mileage, performance, and braking when I put my 19s on my sixxer. Lighter rims would improve mileage a lot.
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Old 04-17-2012, 12:36 AM   #31
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Quote:
Originally Posted by Hutchstang

I got horrible mileage, performance, and braking when I put my 19s on my sixxer. Lighter rims would improve mileage a lot.
I went from 15 stocks to 17 98 gt rims and actually saw an average of 1-2 mpg increase but that could also be tire friction.
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Old 04-17-2012, 07:27 AM   #32
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It would seem to me that the bigger your wheel/tire setup is the better your mileage will be. Think about it, if you drive one mile how many times does the wheel rotate with 22's vs 14's, a lot less. Less rotation for the same distance would equal better gas mileage? But the extra weight between the two would also factor in, so with my theory there are two variables to consider if you are trying to simply increase your economy.
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Old 04-17-2012, 07:47 AM   #33
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But the much larger rotational mass of the much bigger wheels would cause a decrease in efficiancy. I wonder when that happens. I'm sure 17-19" would be OK, 20+ I would imagine is where you'd see gains diminishing and start to head the other way.
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Old 04-17-2012, 09:24 AM   #34
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Is that because of rotational mass or because of the weight associated with them? What if you had 20+" rims that weighed half as much as some 14's? There's gotta be a chart or a formula out there for this somewhere.
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Old 04-17-2012, 09:47 AM   #35
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No way a 20 inch rim would be lighter then a 14
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