15-16mpg on a 22ft coach is spectacular! My 24ft mini gets 8-9mpg up hill, down hill, towing the boat or not. But that's a 350 Chevy. Not sure what modds could be done since these are tweaked for power now. We're pushing a lot of air! Probably the best bet is technique. Keep it a 50mph, feather it up the hills, back off going down and just sit back a smell the roses! Have fun.
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