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Old 07-13-2016, 03:23 AM   #12 (permalink)
Master EcoModder
gumby79's Avatar
Join Date: Dec 2014
Location: Butte, Montana
Posts: 725

little jona - '91 Dodge D 250 first gen cummins LE
Team Streamliner
90 day: 23.4 mpg (US)

Little Jona airo modded - '91 Dodge RAM 3/4 TON D 250 2×4 AUTO
Team Cummins
90 day: 18.5 mpg (US)

The Salted Hound Jenny. - '87 Dodge Ram 50/D-50 5sp 4X4
90 day: 20.24 mpg (US)

Jona Allison aero - '91 Dodge Ram D-250 Le
90 day: 20.76 mpg (US)
Thanks: 208
Thanked 425 Times in 276 Posts
MSD is for more than a race car

I've been thinking it would be easyer to pick up any truck of this body style and stuff my Dodge parts in it than to adjust the stack of bricks body I have now.
Look into a MSD ignition system as a mpg mod(I ran a 6 Digital it has a friend mode flip a switch and 3000 rpm secondary rev limiter primary was set to 5000rpm in case of u-joint failure) . More complete combustion= better mpg . I was able to drop to 87 octane from 91 octane on my 79 chevyK20 =20-30c per gal cheaper (not mpg but more $ in my wallet just the same)bump my timing up to 14° epa called for 4° with the stock HEI set to 10° 91 was required to stop pinging as I had 10:1 CR. At 14°pulling a 33' 5th wheel at 21,000lbs gross on 7-12% grades without pinging.
Disclamer I also in stalled a RPM Air gap intake ,TH400 w/low stall tork converte built to a 450hp speck (800rpm stall, idle set to 500rpm except the alt, it was happy down to ~425 rpm ) and NP 205 (in place of a NP203) these mods resulting in an increase from 7.4-7.6mpg to short
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

'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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