no need going smaller it won't help if it is gas your trying to save.i have a 97 f150 with a 4.6 it gets 15 hgwy and 12 at best pulling a boat.the smaller motors works harder thereore you'll use more gas.went to texas with a guy pulling a 21ss stratos with a sportrac,it sucked as much gas as mine and the short wheel base doesn't handle or ride well,it bounces terrible when you hit humps and dips.



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