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Sounds like the grades (2) on my test rout 6%x3mi and 6%x12mi should be adequate to achieve a test with a reasonable margin of error.
The grades are long enough to achieve terminal velocity at gravity horsepower in neutral 75 to 95miles an hour depending on local weather conditions and configuration of the vehicle. Take note 95mph is 2.5mph faster than my engine will spin in gear(2500rpm).
This gravity drop testing is what I use to determine that the air dam was not beneficial to my configuration prior to the wind tunnel(lost speed on terminal velocity).
Gumby, stay flexible
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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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