im a 4th gen driver(93si) , and for fuel economy i constantly use fifth gear at speeds like 34-40 mph and up and the rpms are at 1500-2000 and i dont get any problem(i dont have a lot of power in that rpm for acceleration --but i could just drop down to 4th, but im not lugging or stalling?)

is there a problem using fifth gear like that? I thought using the higher gear always yielded the best gas mileage.

thanks any help would be appreciated