Been hm for 4 weeks now. Still trying to get better at it, but my last tank in my 00 toyota avalon was 35.4mpg, mostly hiway, 5 out of 7 days were hiway, 2 were in town. Car is rated at 21-29. That is by far the best I've ever gotten in this car. A whopping 602 miles on one tank of gas! My best tank before then was around 460 or 470 miles out of a tank. My question, on this tank I went no higher than 55mph on the hiway with the windows cracked about 1/4 of the way (in 90+ degree weather it really sucked!) I heard that you could actually turn on the ac if you're on the hiway on #1 fan speed and roll up the windows and it's the same difference, any thoughts? Also, gonna bump my hiway speed up to 60mph, can't deal with the 55mph, that's 20 mph slower than I used to go! Which will take me to my next thread and another question.