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Old 02-22-2014, 04:46 PM   #1
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new 2014 mustang v6 low 17mpg help!!

Hi, I just bought a new 2014 Mustang v6 coupe with auto trans. I am getting a really low mpg of about 17 (25%city 75%hwy). I have only driven about 200miles and i dont accelerate or brake hard. Is this normal ?

I expected at least 22mpg as suggested by EPA estimate.
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Old 02-22-2014, 05:00 PM   #2
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How did u get a 17mpg calculation?
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Old 02-22-2014, 05:03 PM   #3
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I noted the odometer reading on my first full tank fillup. noted the odo reading on my 2nd fillup and the amt of fuel put. (2nd odo reading - 1st odo reading) / (amt of fuel filled). Also the mpg displayed in the dashboard matched this.
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Old 02-22-2014, 05:04 PM   #4
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Fill it up again with premium. Could be crap gas. Happens this time of year.
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Old 02-22-2014, 05:07 PM   #5
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yeah could be. but i normally used to use the same regular gas for my old 2003 accord and I used to average a very good 24 mpg (same as EPA estimate).
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Old 02-22-2014, 06:40 PM   #6
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When I got my '14 it took about 500 miles till my MPG was reading correctly. Same with my '13. Give it a few miles, then if it's still low see your dealer.
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Old 02-23-2014, 07:53 AM   #7
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When I bought my 14 new it took some time before the mpg reading was correct, I think it's because of the fact that's the they started it up at the dealer and just let it run idle for a while
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Old 02-23-2014, 08:28 AM   #8
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The OP is also doing manual calculations and getting 17.
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Old 02-23-2014, 09:01 AM   #9
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It took my car about 500 miles to start getting good mpg
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Old 02-23-2014, 09:29 AM   #10
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Give it time to Break-in. Usually 1000+ miles.
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Old 02-23-2014, 09:38 AM   #11
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Wait so u already filled the tank 2 times with only 200 miles? WTF lol
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Old 02-23-2014, 11:01 AM   #12
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Check the tire pressure

Seventeen MPG is not even close to what you should be getting. You should at least average about 24 MPG around town.29 to 30 on the highway.
If I were you I would check my tire pressure because when it is cold they really lose a lot of PSI. Next, A different service station to buy my gas. I suggest 87 octane at every fill-up.
This may take a while but to check the MPG properly you need to run the tank down to about 1/4 full and then fill it up. Now write down the odometer numbers. DO THIS THREE MORE TIMES Then figure how many miles you went and how many gallons used on the three tank fulls.
You can not check MPG on just one tank of gas and be accurate.Plus you gotta let it go down to at least 1/4 tank before filling it.( It never will fill at the exact same level at every fill-up)
If your still getting only 17 MPG it is time to take it in to a dealer to see what is wrong.
It just takes a little time and patients to check MPG right.
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Old 02-23-2014, 11:01 AM   #13
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Quote:
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Wait so u already filled the tank 2 times with only 200 miles? WTF lol
If that's true then I believe it's a right foot problem.
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Old 02-23-2014, 11:01 AM   #14
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If that's true then I believe it's a right foot problem.
jajaja yeah probably lol
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Old 02-23-2014, 02:05 PM   #15
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Wait so u already filled the tank 2 times with only 200 miles? WTF lol
sorry! i meant at both times i filled from 3/4 to full.

Thanks a lot guys for the info!! Last night i refuelled again with premium gas and drove it for about 20 miles in the hwy. I was getting a good 28mpg reading in the instrument panel . I guess its beginning to give better gas mileage now. I shall wait for it to reach 500+ miles before checking the mpg again.
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Old 02-23-2014, 03:17 PM   #16
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Don't go with cheap gas like Arco, costco etc.. they just gunk up your engine and just makes everything worse. I only use chevron 91 on my 3.8 4.6 and 5.0 mustangs. Definitely a huge power and economy difference. I had to make an emergency gas stop and unfortunately only station near me was a costco.
Engine was trembling and not at full potential. Gas mileage went down by 6 on the 3.8
Since then I would never wanna put any of my babies through that. Sure the gas is cheap, but it won't be cheap in a few years when the mechanic hands you a statement. Good luck and enjoy your new pony!

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Old 02-23-2014, 03:55 PM   #17
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Don't go with cheap gas like Arco, costco etc.. they just gunk up your engine and just makes everything worse. I only use chevron 91 on my 3.8 4.6 and 5.0 mustangs. Definitely a huge power and economy difference. I had to make an emergency gas stop and unfortunately only station near me was a costco.
Engine was trembling and not at full potential. Gas mileage went down by 6 on the 3.8
Since then I would never wanna put any of my babies through that. Sure the gas is cheap, but it won't be cheap in a few years when the mechanic hands you a statement. Good luck and enjoy your new pony!

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I never buy cheap gas, Its Shell for me 95% of the time, but is there really this much of a difference? And that quickly?

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Old 02-23-2014, 04:12 PM   #18
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I do shell 87
Still getting only 17mpg
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Old 02-23-2014, 06:05 PM   #19
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Yea Man it shocked me how fast it affected my v6. She also threw a CEL about 30 miles after filling up with Costco. I forgot what code it was but Ford told me to drain all the gas and put what was normally in there along with an additive. All I did was drain it, fill it with chevron 91, deleted the code and it was back to normal the CEL never came back.
Also all 3 of my mustangs are sn95's so the engines are a lot older. But my brother in law has a 2014 GT and didn't see good gas mileage and performance until he switched to 91 octane. A K&N air filter will also help you a WHOLE lot and does not void your warranty.
Shell is ok, but my family and I prefer chevron. Even my wife's 05 pilot acts up when she puts cheap gas so I know it's not just our pony's



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Old 02-23-2014, 08:56 PM   #20
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I'm getting 30mpg at 68mph with Shell 87 octane. I've gotten this on the highway since day one. But I do keep fuel economy in mind while driving. Tried the non ethanol gas also with the same results. 1800 miles on the odometer.
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Old 02-23-2014, 09:19 PM   #21
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I would like to add it also all depends on the area of the USA that you are getting your gas in. Some places in rural west Texas for example only have huge Ethanol washed out gas for example, that have a friend of mine's 80s old ranch trucks shaking like all hell just running on it.

In other cases, you will see places in Iowa have regular gas priced higher then Premium gas, until you find out their Premium is super ethanol rich gas.

We have several refineries in my town, and most all gas comes from one of them, what makes me upset is our cost is higher than farther away cites in my state, yet no cost of the trucking is taking place; so they are making huge profits from the locals. My local costco gas has more Ethanol than my local Kroger store when I did gas testing. In my testing it looks like my Kroger [Food store] is using Shell gas.
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Old 02-23-2014, 09:49 PM   #22
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I usually fill up at B.J.'s or Sams club.

I have not had any bad gas from either yet.I use 87 octane and average 24/27 mostly around town and highway combined.They sell a lot of gas so it is always fresh. My friend Bob that delivers to both say's it is Marathon with STP additive.
I do not drive my car to see how much gas mileage I can get but drive it the way I like to drive. I enjoy the power and don't much worry about MPG. 87 octane is fine and no problems at all.
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Old 02-23-2014, 10:04 PM   #23
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Yep, people will say your car just has to 'break-in'. Try that out.

On the note of gasoline, 87 is fine, but don't buy cheap gas. I personally only buy gasoline from Shell because they're a top-tier gasoline retailer (Top Tier Gasoline). To give my pony even more love, I'll only feed it Shell's 93 octane V-Power. With cheap gas from Race Trac, my calculated fuel estimate is all over the place. With Shell, it reads accurately.
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Old 02-23-2014, 10:10 PM   #24
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I generally by Sam's lowest octane - have for years. Never a problem. I average about 21 in this crappy Atlanta traffic.
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Old 02-23-2014, 10:24 PM   #25
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I've used ARCO gas for 40 years and keep my cars 15+ years. NEVER a problem.
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Old 02-23-2014, 10:36 PM   #26
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I thought running 91 on a v6 will result no gain. Or too rich gas problem?
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Old 02-23-2014, 11:47 PM   #27
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You'll get less mpg until the car starts to break in. I was only get 16 at first. Most will never get 29 to 30. That's with the base 17 inch wheels and 2.73 gears on highway. if you have bigger wheels you'll see a big drop in mpg. Not as big from 17 to 18, but if you have the 19 inch 3.31 performance package it's rated at i think 17/25 city/highway. 23 combined which is what i get. Well, I would but I drive wot everywhere so I'm only getting about 20 now. Still worth the extra money for the fun to me.
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Old 02-24-2014, 12:49 AM   #28
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I thought running 91 on a v6 will result no gain. Or too rich gas problem?
On a stock car, any motor, there really isn't a mentionable gain hp or tq wise (it's very minuscule). I personally buy 93 octane because it's Shell's "cleanest" gas. If they made an 87 version I'd probably just buy that instead, but of course they put the best stuff only in 93.

If you're tuned, different octane tunes are a little better in gains but it's not of my concern, my GT doesn't see much racing or the strip.
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Old 02-24-2014, 06:32 AM   #29
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What rear gearing (ratio) did the OP's mustang come with? 2:73 or 3:31?

You should see much better than 17 with the 2:73, but even the 3:31 is in the low 20's for most of us. I have a 93 MRT tune, and still average about 23 to 24 MPG combined highway and city driving.
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Old 02-24-2014, 11:53 AM   #30
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i would be happy to see 17mpg. I usually don't see anything better than 16mpg city in my 13' 3.7 .. Its probably because where i live there are lights like every 50 feet and none of the speed limits are above 45, so your always braking due to some idiot that wants to drive 35 instead. on highway i'll see anywhere from 23-25 with 2.73 gears. It sucks..
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Old 02-24-2014, 06:45 PM   #31
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I agree with the break in period I was getting 18 19 at first now im looking at 22-24 even with the occasional bout of spirited driving. I could be crazy but after I changed my oil I remember getting an extra day or two out of each tank.
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Old 02-24-2014, 08:44 PM   #32
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Yeah I was getting around 19 mpg and started using 91 and maybe gained 1-2 mpg more on average. I do have a heavy foot and 3:31 gears though. Not sure if I am getting the correct mpg as well.
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Old 02-25-2014, 12:07 AM   #33
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I Wish I got a nickel from everyone complaining about their gas mileage. I would be rich.
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Old 02-25-2014, 10:04 AM   #34
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Alright, this has me thinking... 20 nickels in one dollar. My definition of "rich": I'd have to have a hundred bucks in my wallet that's not going towards paying a bill.

So, that would give me 2000 nickels. Has there been that many reported posts complaining about fuel mileage here?

Us mustang owners are fickle about our mileage, arn't we?
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Old 02-25-2014, 10:33 AM   #35
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Miles per Gallon ??? OR FUN FACTOR ????

It depends on which is most important to you. Me. I like the fun factor and don't really care about MPG that much. I figure my using 87 octane and not 93 like my last two cars I don't need 40 MPG to be happy. I'm really sure the Mustang owners that Mod and tune their Mustangs can care less about the MPG. They like the Fun Factor and don't mind paying extra to have it.
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