Qwkynuf
Well-Known Member
- Joined
- Jul 2, 2014
- Threads
- 19
- Messages
- 351
- Reaction score
- 131
- Location
- Washington
- Vehicle(s)
- 2015 Ruby Red Mustang GT
- Thread starter
- #1
I know that this has come up several times, in different formats, but I wanted to share my experience.
I have a GT with the 50th appearance package, auto, and 3.55.
I had to drive about 275 miles of interstate yesterday, with about half into a strong headwind. Today, I came home, with little to no wind. Posted speed limit is pretty much 65 the whole way.
Since my boss doesn't pay speeding tickets, but *does* pay overtime, I stuck to the posted speed limit in both directions.
At 65mph, the tach is sitting a tiny scootch above 2000rpm.
I filled up right after I left the house yesterday and had to detour for about 10 miles of city driving, which probably reduced the overall mileage by a small amount.
I filled up again today, before heading home. At that time, the indicated mpg for that tank was 22.5. Hand calculated mileage was 21.9. For the return trip, the indicated mpg was 24.5.
The highest I saw was 25.7, for a stretch early on which was 60mph.
The car had 1470 miles on the odometer when I left and 2039 when I got home.
I was able to get 27-ish on the freeway in my '06 V6, so this isn't completely terrible.
Overall average mpg (total miles driven / total gas bought) is sitting at 19.1 hand-calculated and 19.4 on my "Trip 2" screen, which hasn't been reset.
I think that a couple of things factor into the mileage that I can expect - the 5.0 is obviously the biggest factor (combined with how much shoe I stuff into it), the 3.55 rear end is also a factor, but I also think it is important to consider which wheels/tires are on the car, since a wider tire is going to increase the contact patch - which will increase the rolling resistance (and wind resistance by a small amount).
For example, the standard 18x8 wheels use a tire with a 235 section width, which should give roughly an 8" tread width. The 19x8.5s on my car are 255mm section width, so call it an inch wider to make the math easy (it's actually around 3/4"). On the PP cars, the front wheels are 1/2" wider, at 19x9, but the section width is the same 255mm.The rears are another 20mm wider - so another inch-ish of tread width on each tire.
Forgive my rambling, just something to think about.... I would be interested to see if anyone has the same configuration as me and is getting significantly different mpg results.
I have a GT with the 50th appearance package, auto, and 3.55.
I had to drive about 275 miles of interstate yesterday, with about half into a strong headwind. Today, I came home, with little to no wind. Posted speed limit is pretty much 65 the whole way.
Since my boss doesn't pay speeding tickets, but *does* pay overtime, I stuck to the posted speed limit in both directions.
At 65mph, the tach is sitting a tiny scootch above 2000rpm.
I filled up right after I left the house yesterday and had to detour for about 10 miles of city driving, which probably reduced the overall mileage by a small amount.
I filled up again today, before heading home. At that time, the indicated mpg for that tank was 22.5. Hand calculated mileage was 21.9. For the return trip, the indicated mpg was 24.5.
The highest I saw was 25.7, for a stretch early on which was 60mph.
The car had 1470 miles on the odometer when I left and 2039 when I got home.
I was able to get 27-ish on the freeway in my '06 V6, so this isn't completely terrible.
Overall average mpg (total miles driven / total gas bought) is sitting at 19.1 hand-calculated and 19.4 on my "Trip 2" screen, which hasn't been reset.
I think that a couple of things factor into the mileage that I can expect - the 5.0 is obviously the biggest factor (combined with how much shoe I stuff into it), the 3.55 rear end is also a factor, but I also think it is important to consider which wheels/tires are on the car, since a wider tire is going to increase the contact patch - which will increase the rolling resistance (and wind resistance by a small amount).
For example, the standard 18x8 wheels use a tire with a 235 section width, which should give roughly an 8" tread width. The 19x8.5s on my car are 255mm section width, so call it an inch wider to make the math easy (it's actually around 3/4"). On the PP cars, the front wheels are 1/2" wider, at 19x9, but the section width is the same 255mm.The rears are another 20mm wider - so another inch-ish of tread width on each tire.
Forgive my rambling, just something to think about.... I would be interested to see if anyone has the same configuration as me and is getting significantly different mpg results.
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