GT MPG

[DeColores]

Will the GT mileage vary with 87 vs 93 octane?

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[JimmyTwoTimes]

Looking at the official calculations, I got 14.8 on both of my first two tanks. It's actually creepier than that -- I got 14.778 on both of my first two tanks, with the numbers differentiating after that. Weird.

First tank: 105 miles, 7.105 gallons.
Second tank: 173 miles, 11.706 gallons.

All on 93 octane.

This is with probably 80% of my mileage on highway miles, but 80% of my time in city driving (going 5 miles in city traffic takes as much time as going 50 miles in highway traffic).

 

[Hack]

Will the GT mileage vary with 87 vs 93 octane?

Highly unlikely as long as the gasoline/ethanol mixture is the same ratio. If you had a hot enough day that the ECU had to retard timing on 87 but not with 93 I suppose there could be a very slight difference.

If they add ethanol to make the 93 octane your MPG will suffer under all conditions. Ethanol requires more fuel (I think it's about 30% more) than gasoline.

 

[klousgt]

I'm getting a little better than advertised, 15.2 city and 27.4 Highway.

 

[ScottsGT]

I just took a back road trip at 60-65 mph in my 3:55 geared standard trans GT and was getting a peak of 27.4. Around town and horsing around I get 18-19.

 

[Seabee1973]

Looking at the official calculations, I got 14.8 on both of my first two tanks. It's actually creepier than that -- I got 14.778 on both of my first two tanks, with the numbers differentiating after that. Weird.

First tank: 105 miles, 7.105 gallons.
Second tank: 173 miles, 11.706 gallons.

All on 93 octane.

This is with probably 80% of my mileage on highway miles, but 80% of my time in city driving (going 5 miles in city traffic takes as much time as going 50 miles in highway traffic).

I've had to completely change habits of driving... on the highway, I got about 22.5 mpg by the instrument by the time I refueled after several spirited acceleration(pissed off from denial on getting on the freeway) & some city driving... I actually calculated 19.5.... my first two tanks were pretty bad avg 14.mpg... topped off half tank with 93 to 1/4 tank then remaining ones are all 93octane... mpg along with new shifting styles.... ive been getting better mpg.... now I put zmax in my engine oil... since carrol Shelby puts it in all cobras.... hearing it will also improve mpg

 

[Spartan]

I just took a back road trip at 60-65 mph in my 3:55 geared standard trans GT and was getting a peak of 27.4. Around town and horsing around I get 18-19.

Not bad!

 

[Todd15Fastback]

I just drove my car from PA to Atlanta and totaled 850 miles. Hitting a ton of traffic in DC, I averaged 23.1 MPG. My car had 22 miles on it when it bought it. I was very happy with that mileage for a brand new car, hitting a ton of traffic and at times running 85 MPH for an hour at a time.

 

[CooterK]

Seems like some are getting pretty respectable numbers! I average 23mpg with mixed driving in my Civic Si, so if I was able to get near that with the GT I'd be pretty happy.

 

[dubster99]

I'm getting 14.1 this tank. Mostly city driving.

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