Surprising highway fuel mileage

[Bman5150]

very happy with this on a recent big trip I took. This was 95% highway with my cruise set at 75-82 almost the entire portion of highway drive time. Under the same conditions/etc, my 2001 5-speed 260 hp 4.6L V8 would have been about 20 mpg. I guess that’s technological progress!

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[GrabberBargeCaptain]

Yeah, at 65-70 on flat ground you can easily hit 30 with the 6 speed. I assume the 10 speed is even better.

 

[black22gt]

i found that out soon after getting my 6 speed! One particular leg heading towards the SC coast I got 27-28 mpg. Averaged 24-25 on other tanks on that trip. I was floored!

What really continues to amaze me, is that i get 18-20 when i drive it spiritedly, didn't expect that at all! Same driving would have been about 15 mpg at best in my 97 GT, and alot less fun (fast).

 

[CS19]

With my 2002 GT, on the highway, I would get 28.1 mpg. The 2019 GT gets 27.9 mpg. Both auto. Nominally the same mpg despite 50% increase in power.

 

[Mustangpursuit]

Yeah, at 65-70 on flat ground you can easily hit 30 with the 6 speed. I assume the 10 speed is even better.

I do CA to AZ runs and on flat highway portions with no traffic with my A10 I can hold 30-32. I can get 450 miles out of a full tank sometimes.

 

[xcm77]

~31mpg

IIRC @Vlad Soare did better

 

[Justpassingas]

Our last road trip was just over 8000 miles and 23 states. I would reset my Trip 1 after every fill and some tanks I was 29-30 MPGs We’ve taken several trips and I’d see 25+ consistently .

 

[Jxp1962]

It is pleasantly surprising how good the mileage is in these GT’s. I take secondary roads to work, in maine where most times im moving steady at 45-55 mph. Ill consistently get 22-23 mpg

for an 8 cylinder engine im thrilled with the mileage, my old 2017 ecoboost used to get about 25-26 on the same roads…

 

[Vlad Soare]

~31mpg

IIRC @Vlad Soare did better

No way, I've never seen less than 13 on that screen. In town it's more like 18.
I didn't even know it could count that low. Were you driving downhill, with strong tailwind?

 

[J.Ackerman]

I have seen 34.5 from my out-of-the-box Ecoboost Premium on a fairly level run. Wonder if there's a tune out there that would produce 40 - 45, maybe 50 mpg without damaging the engine.

 

[GP-2022 Mach 1]

I regularly get 25+ on my manual 2022 Mach 1 on highway trips. It generally does better than the my 2020 Acura RDX unless I get into some serious spirited driving

 

[LDHunter]

My 22GTCS regularly gets 26-28mpg on the interstate here in mostly flat north Florida and I set my cruise at 83 and run that speed about 70% of the time when traffic allows and rarely below 78.

Every day driving nets me 21-22mpg and I reset the odometer every thousand or two miles or before a trip somewhere.

 

[GTP]

If you use the old fashioned method of miles from the trip meter divided by the gallons printed on the receipt, you will find that the true MPG runs about 5% lower than what the dash indicates.

But you can use that number to enter a correction factor for your car via Engineering Mode.

That is, if you wanted to.

 

[Garfy]

If you use the old fashioned method of miles from the trip meter divided by the gallons printed on the receipt, you will find that the true MPG runs about 5% lower than what the dash indicates.

But you can use that number to enter a correction factor for your car via Engineering Mode.

That is, if you wanted to.

I changed my AFE to 0.950 as it was reading a little high (default was 1.000) so now more accurate and I did register 29 mpg from SLC to Vegas. I imagine the A10 and my 3.15 stock gears were responsible as I'm sure 3.55 gears would've resulted in a little lower mpg. Still, in such a heavy car with a powerful V8, it's incredible fuel economy compared to similar powered cars in the "old days".

 

[EFI]

Shoot I've gotten 28+ on the highway with the A10.

25 is when I'm having fun and/or cruising at 90+.

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