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Old 09-04-2018, 05:05 PM   #8 (permalink)
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Join Date: Apr 2012
Location: Evensville, TN
Posts: 676

Deep Blue - '94 GMC Suburban K2500 SLE
90 day: 23.75 mpg (US)

Griffin (T4R) - '99 Toyota 4Runner SR5
90 day: 25.43 mpg (US)
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I agree with the concept of gearing changes as aero improves(and I have read most of Huchoís book) the problem being I am turning more RPMs than necessary as is, with some of those potential gearing gains already on the table. I have found a several BSFC charts in open literature for the 6.2/6.5 diesels which lead me to believe being moderately loaded (e.g. 50-100%) at low RPMs (e.g. 1200 to 1800) is ideal for this engine.

Thanks for the link, I know funkhoss had referenced his project in my other thread, but I didnít read his build thread until now.

Didnít get much time to work, but I did manage to get a good picture for an overlay plus did some measuring/figuring. The taper at the rear of the roof is meh, very shallow then quickly very steep, so it will be of little use. Also the angle at which the Suburban sits cancels out some of this taper. Attached is my overlay.
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