I recently did a 360 mile roundtrip from Jersey City, NJ to Baltimore, MD in my stock G37XS. 99% highway miles. I averaged 25.8 MPG. I do have a Thule rooftop bike rack which definitely brought down the MPG.

 

I'm averaging 18.5 City and 22.5 highway....Happy with the mileage considering 0-85 mph..... in the corner all the time....

 

Good to hear that our cars can definitely make this trip on less than a tank. Btw are you planning to attend the meet in August?

 

I just found out about it. I'll try and make it.

 

Got 27.2 MPG last week. That was filling up before the trip and calculating gallons used after filling up on return. Highway driving averaging 75-80 mph.
I only use BP gas here, that seems to help a lot.

 

I get 13.6mpg average, 75% city, 25% highway. Completely stock I might add.

 

With the cruise set at 70, I get around 32 mpg almost every time.

 

I'm getting 22.19 MPG of 60% city and 40% highway driving.

 

22.1 for me for the past 2 months without resetting. That's about 60 freeway, 40 city. The worst I've averaged is around 15 with only city driving. The best is 24.5 on strictly freeway, cruising around 75. How you guys get 30+ MPG is unreal to me.

 

I'm getting 24.2 mostly highway, 78 mph. 2010 XS How are you getting 27 mpg or higher? I use BP.

 

I don't think I ever got anything over 24 mpg with ~85% highway driving on a 100 mile round trip commute

 

Downhill both ways, right?

 

Most likely with a gale force tail wind....and a couple passengers pushing out back.... that's the only way I'm breaking the 30's....

 

i get about 5 mpg

 

Just hit 20.2 averaging 28 MPh 70 percent highway should get higher but got the car 4 weeks ago said it averaged 19mph