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Old 04-25-2017, 02:43 PM   #26 (permalink)
Merlyn2220
Deep Lurker
 
Join Date: Sep 2016
Location: Central Florida
Posts: 53

Creepy Van - '95 Ford E150 Cargo
90 day: 14.45 mpg (US)
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And very odd but interesting results from last tank. 2 tanks with a 20-30 degree departure angle taper at 14.44 and 14.31mpg. This one with a supposedly better 12 degree angle...13.79mpg. So I'm leaving it alone and running another full tank to be sure the result isn't a fluke.

The only other thing I changed between the 2 tanks and the latest, is that I increased the tire pressures from 35/45 to 50/60 F/R. I can't see FE being worse with higher pressure, in general. But I know that on bicycles there is a point of inversion, where the rolling resistance starts increasing above around 130-140psi. So it's unlikely but possible. If the next tank is also ~13.8 I might drop the tires back down to confirm that there's no substantial difference.
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