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Old 05-14-2013, 09:55 PM   #36
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Tuned Bama 93S for a 97 GT I get 12.5 city.
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Old 05-14-2013, 09:58 PM   #37
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Tuned Bama 93S for a 97 GT I get 12.5 city.
480 crank HP and I get 16mpg city with Bama 93Hybrid tune
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Old 05-15-2013, 12:39 AM   #38
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480 crank HP and I get 16mpg city with Bama 93Hybrid tune
Yes I'm envious.
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Old 05-15-2013, 10:33 PM   #39
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With full boltons And tune (of course) I have 17 city. That's with some spirited pulls.
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Old 05-16-2013, 11:40 AM   #40
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Those ave mpg display things are never accurate. The only one I have seen that is close to real is on the wife's Lexus. You gotta do the math. I get 19-20 on my commute 50% highway. My display consistently reads between 17.6 up to 17.9. Another weird thing....I have always used 92. Since that surpasssed $4 / gal a while ago, i have run a couple tanks of 89. Mileage actually went up to 21.5 on 89. Oh yeah, no mods other than Roush AB's.

But then, we didn't buy them for the mpg's.
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Old 05-16-2013, 02:08 PM   #41
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Those ave mpg display things are never accurate. The only one I have seen that is close to real is on the wife's Lexus. You gotta do the math. I get 19-20 on my commute 50% highway. My display consistently reads between 17.6 up to 17.9. Another weird thing....I have always used 92. Since that surpasssed $4 / gal a while ago, i have run a couple tanks of 89. Mileage actually went up to 21.5 on 89. Oh yeah, no mods other than Roush AB's.

But then, we didn't buy them for the mpg's.
*shudders* I won't put 89 in my car ever. Plus 93 has been under $4 where I live!
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Old 05-16-2013, 03:43 PM   #42
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*shudders* oh no, not the age old debate on the best fuel. The thread is pertaining to MPG's.
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Old 05-16-2013, 03:50 PM   #43
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*shudders* oh no, not the age old debate on the best fuel. The thread is pertaining to MPG's.
Lol your the one bringing it up. Also it isn't an age old debate in this case. Your supposed to run the recommended grade at minimum. Which is 91 per Ford. It can run on 89 but the car will be limping and running it through high RPMs are scary. I agree you can argue running 91-93 on a stock car. Mine is tuned for 93. Cannot run less.

Also I get an average of 22MPG right now. That is 80% highway and 20% city and a lot of red lining. My car lives at 7200RPM.
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Old 05-16-2013, 04:46 PM   #44
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I only brought up running 89 in the context of how it was odd my MPG increased. I would have thought the opposite. A stock 5.0 is designed to run on 87. Ford recommends 91 to obtain the advertised 412 HP. The computor adapts the engine to the octane.

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My car lives at 7200RPM.
I doubt it will be a long life.
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Old 05-16-2013, 04:53 PM   #45
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I only brought up running 89 in the context of how it was odd my MPG increased. I would have thought the opposite. A stock 5.0 is designed to run on 87. Ford recommends 91 to obtain the advertised 412 HP. The computor adapts the engine to the octane.

I doubt it will be a long life.
Lol why because I rev it past 6900? If I remember right 8K is hard redline. Add a boss Mani and you can run her too 7600-7800 with no issues. This car absolutely loves to revv high.

Stock 5.0 is designed to run on 91. Read your owners manual. 87 is the minimum it can operate at. Isn't ideal. With 11.0:1 compression running on 87 and doing spirited driving is a ticking time bomb.
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Old 05-16-2013, 06:34 PM   #46
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Stock 5.0 is designed to run on 91. Read your owners manual.
uummm....okay.....

Page 293 "Your vehicle is designed to use Regular unleaded gasoline with a pump octane rating of 87."

Page 294 "Your vehicle will run normally on 87 octane regular fuel without damaging the engine, but premium fuel with an octane rating of 91 or higher is recommended for best overall performance."

nuff said
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Old 05-16-2013, 07:00 PM   #47
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http://www.google.com/url?sa=t&sourc...46471029,d.aWc
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Old 05-17-2013, 09:20 AM   #48
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uummm....okay.....

Page 293 "Your vehicle is designed to use Regular unleaded gasoline with a pump octane rating of 87."

Page 294 "Your vehicle will run normally on 87 octane regular fuel without damaging the engine, but premium fuel with an octane rating of 91 or higher is recommended for best overall performance."

nuff said
Exactly, 91 or higher is recommended. It is designed to run on 87 if need be, but recommended to use 91 or higher
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Old 05-17-2013, 09:25 AM   #49
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Exactly, 91 or higher is recommended. It is designed to run on 87 if need be, but recommended to use 91 or higher
Yeah he proved my point....so....lol?
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Old 05-17-2013, 09:28 AM   #50
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Yeah he proved my point....so....lol?
nuff said
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Old 05-17-2013, 01:51 PM   #51
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My only point was the engine is not a "ticking time bomb" and won't be "limping". I agree about not running 87. I won't do it either, but it is not an issue to do so. The HP is reduced accordingly. We dont have 91 or 93 in the Northwest, so its 89 or 92. My wife's Lexus also "recommends" premium fuel. It has run 113,000 trouble free miles on 89. On occasion she fills it with 92 and there is no difference.

Both cars see plenty of "spirited" driving which does not require "living at redline". No matter how much an engine loves to rev, there can be no denying that it's useful life is reduced accordingly.
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Old 06-21-2013, 11:31 PM   #52
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I would get 300 or more miles to a tank based on actual miles and the calculated miles to empty on the computer, but I don't let it get any lower than 1/4 tank. I have about a 50/50 mix of city and highway driving, with some spirited driving thrown in the mix. I've averaged 19.7 mpg since I got the car with 66 miles and now I'm up to 4800. I always use 91 octane and only have Roush axle backs.

One thing I've wondered is why Ford didn't try to put on a bigger tank for some extra range. I understand there could be space issues for a bigger gas tank, but does anyone know why they stuck with a 16 gallon tank versus going with a larger one?
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Old 06-21-2013, 11:48 PM   #53
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Even though you may have 0 miles to empty there is still fuel in the tank. It's to keep your fuel pump lubricated and cool since fuel is the only thing in the tank. Well ill say fuel SHOULD be the only think in the tank lol. Oh and to OP I'm getting an average of 19.4 mpg combo of city and hwy usually spirited driving.
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Old 06-21-2013, 11:57 PM   #54
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The fuel cools the pump and prevents overheating and failure ^
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Old 06-22-2013, 02:04 PM   #55
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340 miles per tank-mixed driving,I have an automatic.
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Old 06-22-2013, 03:36 PM   #56
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17.8 in my 12 GT, Just added JPC breather package and K&N drop in and saw a few bips (about .4) increase in mpg. Get about 260 a tank, city abut 70% driving, Hwy 30%
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Old 06-22-2013, 03:38 PM   #57
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I usually get 290 per tank, but it's almost all city driving.
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Old 06-29-2013, 11:33 AM   #58
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Peak power is made at 6500 rpms on a stock car
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Old 07-11-2013, 01:20 PM   #59
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~210, but I've only been driving it city for the past 3wks now. No hwy yet. Can't get over 14.7mpg according to the dash and that's driving good. Expected though : /
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Old 07-11-2013, 01:34 PM   #60
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~210, but I've only been driving it city for the past 3wks now. No hwy yet. Can't get over 14.7mpg according to the dash and that's driving good. Expected though : /
The manuals are rated at 15 city and the autos at 18 city so if you have a manual you're not too far from what the manufacturer rating is but that still does seem a little low. Have you tried hand calculating the mpg and comparing it to the computer to see if or how far off the computer is from the true mpg?
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Old 07-11-2013, 01:38 PM   #61
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Not yet. I'll do that after this tank. The car only has 375 miles on it. Is it a myth or true that it gets better after it's "broke in"?
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Old 07-11-2013, 01:59 PM   #62
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Mine had 66 miles on it since I've owned it and I have just hit the 6000 mile mark. Really haven't noticed any fluctuations in gas mileage after 1000 miles when the engine is fully broken in (my rule of thumb). I get a good mix of city and highway driving and I don't think I've had a tank under 18 mpgs
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Old 07-11-2013, 05:12 PM   #63
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Not yet. I'll do that after this tank. The car only has 375 miles on it. Is it a myth or true that it gets better after it's "broke in"?
the car is "broken in" already from the factory. do you do a lot of stopping and starting? quick accelerating? city driving is a v8 killer unfortunately
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Old 07-11-2013, 07:57 PM   #64
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Update : ever since i got my supercharger and dyno tune my car has been getting better gas mileage I'm at 312 miles on a tank full averaging 19.5 mpg city.
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Old 07-11-2013, 08:16 PM   #65
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~210, but I've only been driving it city for the past 3wks now. No hwy yet. Can't get over 14.7mpg according to the dash and that's driving good. Expected though : /
Don't worry bro, I think that's about right.. mine was exactly 14.7 as well for like the first 500-600 miles or so until I got on the highway a few times.. Now its stuck on 18.7...
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Old 07-11-2013, 09:49 PM   #66
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Don't worry bro, I think that's about right.. mine was exactly 14.7 as well for like the first 500-600 miles or so until I got on the highway a few times.. Now its stuck on 18.7...
I think you meant "don't worry sis"... She's a lady
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Old 07-11-2013, 10:03 PM   #67
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I think you meant "don't worry sis"... She's a lady
Don't ask don't tell.
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Old 07-11-2013, 10:14 PM   #68
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Lol
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Old 07-11-2013, 11:41 PM   #69
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Old 07-11-2013, 11:52 PM   #70
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I think you meant "don't worry sis"... She's a lady
Oh my bad.. and she's married to Thor.. that's pretty cool..
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