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I drove a 1995 F150 with a large topper for a while though and was able to consistently get close to 20. It had Ford's 300 straight 6 (a 50 year old engine design) and not particularly tall gearing. I suspect if you can get your gearing tall enough, keep your speed down, and incorporate some driving techniques such as EoC, 25 could be realistic under the right conditions!
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