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Les drag =better mileage
my dad told me about a semi trailer modification were the wing is placed 90% below the top of the trailer angled down. It protrudes 1/2- 2"above the roof line . It acts as an air scoop , to fill the void (vortex) behind the trailer.
Also my 1982 Chevy Blazer S-10 had a similar design. GM said it was to keep the back glass free of dust.
Good work on your prototyping
for your next roof wing try concave with vortex generators @ the outer tips
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1st gen cummins 91.5 dodge d250 ,HX35W/12/6 QSV
ehxsost manafulld wrap, Aero Tonto
best tank: distance 649gps mi 24.04 mpg 27.011usg
Best mpg : 31.32mpg 100mi 3.193 USG 5/2/20
Former
'83 GMC S-15 Jimmy 2door 2wd O/D auto 3.73R&P
'79 Chevy K20 4X4 350ci 400hp msd custom th400 /np205. 7.5-new 14mpg modded befor modding was a thing
87' Hyundai Excel
83 ranger w/87 2.9 L FI2wd auto 18mpg on the floor
04 Mitsubishi Gallant 2.4L auto 26mpg
06 Subaru Forrester XT(WRX PACKAGE) MT AWD Turbocharged 18 plying dirty best of 26mpg@70mph
95Chevy Blazer 4x4 auto 14-18mpg
04 Chevy Blazer 4x4 auto 16-22mpg
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