Going to La Plata and back yesterday (278 miles on the odometer) via I-70 I netted myself 29.5 mpg! I let the speed drop to around 50-55 on the uphills (3rd gear, a little bit of 4th gear), and tried to cruise between 55 and 60 for most of the rest of it. On the way home I was getting it a little more, but it was downhill so you can go 75 in 5th without touching the gas
I'm telling ya, it's all about driving style...now I want to take a trip to Nebraska or Wyoming where I don't have all those hills to fight! On the way back I set the cruise control on 52 mph in 3rd gear and just let it go on the way up to Eisenhower!