Well!! action speaks louder than words.
This comparison is the info in my fule log from Dec 31,2014 through June 20,2015 1st 6 months of ownership
1991 Dodge D 250 first gen cummins LE Gas Mileage (little jona) - EcoModder.com
Bone stock as dodge buld it.
2501mi 137.140 Gal. 46+ oz CETANE booster =18.237 mpga ( miles per gallon average)
in all conditions, loads, weather, grades, and speeds
This includes exost wrap (not stock)
VS
Airocap with all stock w/exost wrap
5062mi 219.451Gal. 75+oz CETANE booster = 23.067 mpga ( miles per gallon average)
in all conditions, loads, weather, grades, and speeds
Lifetime Fuel Economy: 22.3 mpg (US), 10.5 L/100 km, 26.8 mpg (Imp)
90-day Fuel Ec
I am planning an ABAB TEST later this summer however wile on the road. The canapé is not ssomething that I should leave tied to a tree till I get back past that part of the country.
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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