Like title said, what is your best & worst MPG for the ISF? I'm sure not a lot of people care about MPG in a 400hp+ V8 but I'm curious & the ISF definitely achieves the best MPG out of all the competitors in its class (RS4, M3, C63) seeing close to 26mpg all highway thanks to the 8spd tranny. So for all you that don't care about your best mpg, post your worst lol.

 

Best was 30.4mpg driving out to Vegas. Cruise control set to 75 and let her go.
Worst was about 7 mpg while playing on the track lol. Average is around 22-24mpg

 

22mpg as I daily it with mainly highway. 14-15 on canyon cruise combines with the drive to and from home

 

Best I seen was when hitting the highway immediately after filling up. It was in the 30ish MPG range. Worst during track day obviously seeing 4mpg, lol. I was surprised at the MPG at high speed for extended driving though. I averaged between 100-120mph for about 1.5 hours and still got 22mpg!

 

4.5 on track / 28.2 highway

 

About 16-17 for mostly normal 50/50 city/highway driving. Wish it got better but oh well. Havent really done an all highway so ill see then.

 

10 MPG average for the first week I had the car, had to play with the new found power. =)

Average now is about 18-19MPG, about 50/50 highway and streets. Which is about the same I got with my IS350.

Best is 30.8 MPG cruise set at 75mph from Santa Barbara to Camarillo, CA.

 

Same here. I've never seen more than 28 and change on a highway drive.