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Old 02-23-2013, 05:59 PM   #11 (permalink)
SilveradoMike
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Join Date: Feb 2013
Location: Northern CA
Posts: 29

The Truck - '99 Chevrolet Silverado Base
90 day: 17.92 mpg (US)
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Unfortunatly replacing the shell isnt in the cards. The height of the current one is barley tall enough for my cargo. I think I may try the "wing" Ill test a few designs with foam then Ill fiberglass one up when I get some measureable positive results. I think its amazing how coasting in neutral will make it instant mpg shoots up over 100mpg. You think a 1/8" steel under tray/skid plate would make a measureable gain? Maybe another slightly less then 1 mpg? I would imagine it would be in the 300lb range for weight. On a partial grill block. My engine coolant temp is already 195°f not really looking to raise it to much more. I get the aero positives of it but how much would you think it will raise temos? I know it varies with different parameters but lets just say for this we're on hilly terrain average speed about 35mph max maybe 60mph coolant temp 195°f.

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