I expect this summer to get consistent 25 mpg. That helped 1 or 2 mpg when I figured that out. I hope to do some testing this summer on various blends of gas when the wind is nil and temperatures are stable. Both the '98 and '01 seemed pretty consistent on mileage, typically averaging 22.5-24.5 mpg. I have driven other vehicles in low and high altitudes.
High altitudes seem to help mileage a bit with the thinner air despite loss in power.
Couldn't find the stuff on their site. Here are my observations. Judd said he could not squeak over 17 mpg in a '98. I bought a '98 last August. My typical mileage is 22-24 mpg.