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Re post #22
Quote:
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Generating an intake manifold vacuum requires work, and to generate a larger vacuum, a greater amount of work must be expended. Work requires gasoline in either Car A or Car B, so Car B requires more gasoline simply to push Car B up the same hill as Car A, everything else being identical.
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DWL (driving with load) is driving with the highest possible Vacuum reading posable aka the best mpg per load.
There are many examples of this. The real world trumps the paper this time.
As to personal experience.
When I installed a MSD 6 Digital ignition system (from a stock HEI) and a RPM Air gap Edelbrock intake (from a stock aluminum) . my vacum went up 2"from 15"mg to 17 at idle (625rpm engine liked 425rpm but the alt. quit below 600rpm and the 800 stall tork converter would not allow a stock750-800rpm idle) and I saw an improvement in mpg of 2.5. (From 7.5 allday every day. to 9.5-14mpgdepending on how I drove.)
This was a 6000lbs tall (24"under the frame) off-road capable 4x4 that was also used to pull a 16,000lbs 5th wheel
More of the right kind of power = more efficiency = better mpg..
Gumby Stay Flexible .
__________________
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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