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We've seen a "lifetime" average of 24.8 on our 250 AWD, about 50/50 mix of highway and suburban driving with some mountain climbing thrown in. Pretty pleased with that kind of fuel mileage, especially since my spouse has a lead foot!
I get about 22 mpg with my 250 all in town, ac always on and in 100+ temps. My last trip to San Diego at about 90-95 mph got me 25 mpg...I can't complain.
Man, I've been only getting an 18.9 average with combined highway and local for my IS350 , man this sucks, i get bad mpg, but I guess you can also blame my heavy foot.
well today in the morning my screen read 17.9 due to me flooring it all night on wed. when me and my friends were out. but tonight when i was driving my grandma home i was on the highway and i read on the threads somewhere that u can get some better mpg from using the cruise ctrl. so i went about 70 and set it on cruise and it was about a 50 mile drive there and back and i came home with 25.4 mpg as a average. xD lol (IS350 btw)