5th gear, wind resistance, and load are mpg killers on these bikes. 1st or 2ndGen. I just got back from The Dalles with the '07 and got 47mpg on the Mt Hood ride, and the only time I hit 5th was going down hill. Pulled a trailer to Cody with the '99 and got 26mpg in 5th @ 75mph...until I dumped the trailer and then got 40mpg on a day ride to Shell Falls. With the '83VR I'd get 35-37 around town, and in the twisties in 2-3-4 gears only, never 5th unless downhill, I'd average 50. High speeds and 5th gear are the biggest mpg killers... Haven't rode the '04 trike any distance yet, but I'm not expecting much due to the Voyager Kit.