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Old 06-03-2008, 10:19 PM   #3 (permalink)
whokilledthejams's Avatar
Join Date: May 2008
Location: Fredonia, NY
Posts: 322

Boxy Brown - '04 Scion xB
90 day: 35.48 mpg (US)
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In college, I had a 1995 GMC Sonoma (S10 clone), with a regular cab and short bed (4cyl, 5 speed, 2wd-- totally stripped-down model). I had a tonneau cover the whole time I owned it, and I definitely got several mpg less at highway speeds when I didn't have it on (not that often, but I definitely could tell). With the cover on, and normal driving, I got around 30mpg at 75mph. My all time high was 32mpg, without really trying, and before I ever heard of hypermiling.

But yeah, to keep on topic, keeping the tailgate up is better than down, and a tonneau cover is better still. It's not as good as fashioning a cap into a pseudo-kammback, but every little bit helps.
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