I'm not ready to repower my Marlin yet - I hope - but when that time comes, every option will be considered. I have to confess that although I initially found these to be a bit out there aesthetically, they look ok hanging on your transom, with the more conservative color scheme. I'm satisfied with my F250s performance but if I could squeeze a couple more tenths per gallon, that would significantly increase my range and weigh heavily in my decision. So, very interested in some numbers. Good luck!!