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as a fellow ranger owner[also on RF, same name] I can tell you that a grill block will work wonders. I have a 3in b/l 33x12.5's, and drive 3 mi's city and 75mi highway everyday. I was getting 14.5 on average, i did a grill block, and it bumped up to 15.5, and now i'm getting 18.5 by drafting whenever possible on the highway.
I'm thinking of putting my skid plate[stock steel style] one back on, and also making some side plates out of plastic. I've also been thinking of at least partial underbody panels. Like from the frame to the cab edge, it will be a sharp angle, but i'm thinking that it could help.
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Randy
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