I'm only getting 17.4 mpg and 25.8 mph average on my '09 7AT w/ 3200 miles on it. How are you guys getting these high numbers?

 

Hah i wish i could get mpg like that. So far i get 15mpg with 700 miles on the car.

 

Road trip! These are all highway miles. Still... pretty impressive for a 3.7L 330HP V6!

I reset the meter and started off while cruising and babying the throttle at around 70MPH.

 

Fill your car up on the hwy...go out on cruise control @ 55 and reset your mpg reading.

 

I get 10.2 l/100km or 23.3mpg combined for the first 2,000km.

 

After 1 year of country-driving my G37S in hilly country (8000 miles) i am averaging 19mpg overall.

 

Just took a road trip from Maryland to Orlando for the 4th of July. Put 1600+ miles on the car, all highway on I-95. Averaged 25.6 mph with the 7 A/T the entire way. I was pleasantly suprised with the highway mileage actually matching up with the car's EPA rating, I never got near the EPA rating on my other cars.

After averaging 15-16 mpg on the first 2 tanks of gas, I started getting in the low 20s, and now, at 2900 miles, I averaged 25.6 on this road trip so I am a happy camper. Not bad at all for a 330 hp premium gas drinking coupe!

 

20 minute commute; 15 min street and 5 min freeway... 16 MPG. aggressive driving. irvine, ca

 

When I drive SOLELY HIGHWAY I am getting about 25/26 MPG. SOLELY CITY is about 19.5 (+/- 1MPG depending on how aggressive I like to be) and when it's a mix then it's somewhere in between

 

16.9 City with avg of 25 i think. I dont know how the other guys are getting much higher

 

from a physics point of view, how much gas you use at a certain speed is defined by this equation:

mv(^2)
-------- = amount of gas
2


where m= mass, v= velocity

so if you double your speed say from 30mph to 60mph, you are quadrupling your gas usage because the velocity is squared. (this does not account for air resistance.)

 

We took a trip recently from Chattanooga to Atlanta and filled up right before leaving. Average MPG upon return was 28 MPG. However, by the time the tank ran empty a few days later after being back in town (450 miles), it was showing 26.9 MPG. Not too bad.

 

My first tank averaged 22.25 in mixed driving. But I pretty easy on the car as it is still being broken in.

 

I just broke 2000 miles and I've been averaging 20.6 mpg (50% city driving). During the first tank I was averaging just under 18 mpg and then just under 20 mpg on the second tank (and that was when I was babying it)! I'm glad that the mpg has slightly improved after the first 1000 miles because I've certainly stopped babying it once she was broken in!

 

My G has about 1200 miles. With heavy heavy miami bumper to bumper traffic I'm getting 15.3 around town. Doing a road trip this weekend to see what the MPGs are like.