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Old 09-20-2012, 11:53 AM   #1
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fuel efficency question

friend got a 2007 mustang GT, (hopefully he joins here soon himself) it is bone stock and he said he is getting 370 km (231 Miles) per tank. and when my 07 was stock i was getting over 450+ km (281 Miles) probably more. any ideas as to why his car is so inefficient? I get over 500 km (312 Miles) now after some mods and a tune

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Old 09-20-2012, 12:33 PM   #2
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Not as well kept, heavy foot, auto, uses 87 octane, dirty filter and or tb, the list goes on and on
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Old 09-20-2012, 03:03 PM   #3
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Quote:
Originally Posted by Silversky545
Not as well kept, heavy foot, auto, uses 87 octane, dirty filter and or tb, the list goes on and on
+1 on the heavy foot. I can usually get close to an extra 50 miles on my tank just by wearing a lighter shoe lol.
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Old 09-20-2012, 03:07 PM   #4
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Re: fuel efficency question

ive seen him drive it is a very light foot. and most of it is city driving
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Old 09-20-2012, 03:22 PM   #5
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Re: fuel efficency question

I'm getting about 280-290 miles per tank on my commute with a mix of highway and city driving. Hell I've gotten over 30 mpg before on a 200 mile trip keep it on cruise control! Needless to say it's not how I drive a mustang all the time!
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Old 09-20-2012, 04:02 PM   #6
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I get around 300 per tank with 60% city and a heavy foot. Hell I guess I am doing better than I thought!
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Old 09-20-2012, 05:30 PM   #7
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Re: fuel efficency question

Can't say that mine is even close to stock or that I am light footed but I get about 200 out of a tank. Just throwing that out there.
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Old 09-23-2012, 08:52 PM   #8
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I use to get 312 per tank but now I get 260 per tank don't know why ?mabe I should do A tune up but I only have 40 k on a 2006 it's wierd
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Old 09-23-2012, 08:54 PM   #9
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Re: fuel efficency question

Mine is bone stock, I get a little over 300 per tank,
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Old 09-23-2012, 11:45 PM   #10
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Quote:
Originally Posted by Pattyboy
I use to get 312 per tank but now I get 260 per tank don't know why ?mabe I should do A tune up but I only have 40 k on a 2006 it's wierd
Did you change tire size?
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Old 09-23-2012, 11:55 PM   #11
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One thing to note is actual mpg. When my light comes on, 400-450 miles, I can run to 475-550 miles. I drive a solid 10-20 miles into my "no fuel left!" zone.

So he might be getting fine mpg, but he fills up at a different time. I believe the 2012 v6 has a light come on around 14 gallons used, from experience. Others will have to chime in about yours and his years. But if someone thought there tank was empty and filled up when the light came on, in a 2012, they would be losing 62 to 84 miles per tank.

---------- Post added at 10:55 PM ---------- Previous post was at 10:54 PM ----------

Quote:
Originally Posted by Aggiesrok

Did you change tire size?
He would have to have a MASSIVE size jump. Like, 10 inches bigger lol
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Old 09-24-2012, 12:41 AM   #12
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Quote:
Originally Posted by UltArc
One thing to note is actual mpg. When my light comes on, 400-450 miles, I can run to 475-550 miles. I drive a solid 10-20 miles into my "no fuel left!" zone.

So he might be getting fine mpg, but he fills up at a different time. I believe the 2012 v6 has a light come on around 14 gallons used, from experience. Others will have to chime in about yours and his years. But if someone thought there tank was empty and filled up when the light came on, in a 2012, they would be losing 62 to 84 miles per tank.

---------- Post added at 10:55 PM ---------- Previous post was at 10:54 PM ----------



He would have to have a MASSIVE size jump. Like, 10 inches bigger lol
It changed your speed as well as your odometer. Bald tires vs new tires can knock your speedo 5 mph at 70.
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Old 09-24-2012, 06:13 AM   #13
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Quote:
Originally Posted by Aggiesrok

Did you change tire size?
Yes I did I had 17 " changed it to 18 " but I lowered the size of tire and also went wider I guess that may be the reason . I'm sure that can be adjusted right
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Old 09-24-2012, 08:09 AM   #14
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Quote:
Originally Posted by Pattyboy

Yes I did I had 17 " changed it to 18 " but I lowered the size of tire and also went wider I guess that may be the reason . I'm sure that can be adjusted right
A smaller diameter will turn faster and show more distance. I had the same problem after changing tire profiles. I fixed it with my SCT tuner, you can tell it the revs per Mille of your tire and correct your speedo. Discount tire has a calculator on their website for how much your speed will be off by changing tire size.
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Old 09-24-2012, 11:18 AM   #15
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Quote:
Originally Posted by Aggiesrok

It changed your speed as well as your odometer. Bald tires vs new tires can knock your speedo 5 mph at 70.
I don't think bald tires could function that low. Cutting two inches off the size would not be drive able. Tread is usually an eight of an inch or so, if the tires didn't pop, all of the wiring would behanging out. Maybe if the tire pressure was crazy low, it might also have that affect.

Quote:
Originally Posted by Aggiesrok

A smaller diameter will turn faster and show more distance. I had the same problem after changing tire profiles. I fixed it with my SCT tuner, you can tell it the revs per Mille of your tire and correct your speedo. Discount tire has a calculator on their website for how much your speed will be off by changing tire size.
Every inch is 2.7%. keep in mind increasing tire size is like lowering your gearing, and decreasing tire size is like increasing the gearing.
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Old 09-24-2012, 01:58 PM   #16
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You don't by a mustang for mpg unless it is v6 IMO
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Old 09-24-2012, 03:17 PM   #17
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Re: fuel efficency question

Quote:
Originally Posted by UltArc View Post
I don't think bald tires could function that low. Cutting two inches off the size would not be drive able. Tread is usually an eight of an inch or so, if the tires didn't pop, all of the wiring would behanging out. Maybe if the tire pressure was crazy low, it might also have that affect.



Every inch is 2.7%. keep in mind increasing tire size is like lowering your gearing, and decreasing tire size is like increasing the gearing.
My tires have more than an 1/8" of tread. But remember that it's double that because it affects the diameter, so 1/2" of tread has a 1" diameter effect. Add in a lower than normal tire pressure and bumping up to a larger tire. My speedo was off by 5 mph after changing to a 1 plus tire size, maybe it was off to begin with. But it does change your speedo and odometer.
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Old 09-25-2012, 07:47 AM   #18
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Originally Posted by Alonzo.dargan1
You don't by a mustang for mpg unless it is v6 IMO
+1
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Old 09-25-2012, 08:58 AM   #19
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Quote:
Originally Posted by Aggiesrok

My tires have more than an 1/8" of tread. But remember that it's double that because it affects the diameter, so 1/2" of tread has a 1" diameter effect. Add in a lower than normal tire pressure and bumping up to a larger tire. My speedo was off by 5 mph after changing to a 1 plus tire size, maybe it was off to begin with. But it does change your speedo and odometer.
If you bumped up a tire size, and never changed the computer, then low tire pressure and low tread should have evened it out.

But I do get what you are saying. I have always driven total junk to save my money for a decent vehicle, so economy tires are definitely different than ours. I noticed our speedo's are huge, which I think is made to account for different tire sizes, since we can have 17,18,19, or 20. It might even go higher, as a factory option.

One reason I bought instrumentation is to ACTUALLY see how fast I am going-our speedo guessing game is not fun to me lol
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Old 09-25-2012, 09:33 AM   #20
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I get 31.6 mpg if i keep my foot out of it
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Old 09-25-2012, 09:40 AM   #21
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Originally Posted by 2300turboford
I get 31.6 mpg if i keep my foot out of it
Out of an 8?! Wow, major kudos.
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Old 09-25-2012, 09:44 AM   #22
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Quote:
Originally Posted by UltArc

Out of an 8?! Wow, major kudos.
Its a 2.3 turbo
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Old 09-25-2012, 12:01 PM   #23
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I'm lucky to get 12.6 mpg in the city with moderate driving and mostly staying out of the boost. I do get 24.8 mpg on the highway though.
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