my trailblazer gets its best at flat road 80-85 I have 3.42's and 33's, so the final drive ratio is really low... it actually does very poorly at 70, but i've gotten 17 mpg with 2 ppl gear and bad aerodynamics on a trip from va. But the t/a seems to enjoy 75, fast then that and the suspension sucks (i think the previous owner beat on that part of it too much...
