Both motors spin out to 6100 or 6150 @ WOT. I periodically run them @ this speed a few times a season to ensure the health of the engines for a minute or two. I would see about 1.4 to 1.5mpg's depending on my load on the lighter side and 1.1 to.1.2mpg's when heavily loaded for a canyon run, 330 gallons of fuel and 200lbs of ice and gear until it burnt off on the way home where we'd see 1.3 to 1.5mpgs, 3 or 4 guys. Please call or text me @ 201-725-8013 to discuss.