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Join Date: Nov 2012
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My personal best happened in 2017. bone stock 1999 f250 4x4 short bed supercab 4x4 automatic with stock 265/75r16 highway tires going 65mph for about a 4.5hr road trip got 19.3-19.5mpg round trip. Few months after that installed level kit and 285/75r16s and now my best is 17ish. BUT... adding the tonneau cover and cruising nicely on the freeway I can hit 18ish mpg on the highway only. I average 14ish with mostly city driving now though.
There is one fella Big Dave who is a pioneer with ecomodding. He has a 2000 f350 6 spd 2wd with MANY AERO MODS. custom aerocap, front air dam, gear vender overdrive, higher gears in the rear, specialized LRR tires, slight tuning mods getting 26-27mpg highway. He shows all his work on the ecomodder forum and even trucktrend magazine did an article on him.
2000 Ford F350 Power Stroke Diesel Truck Mileage - Diesel Power Magazine
-99 F250, 4X4, 6.0 trans cooler, 08 mirrors, 05 grill, AIS Intake, lvl kit, JW Vbody, cncfab hpop lines, WW2.
04 Excursion Modified, 04 F350 Modified, 06 F350 Modified
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"Its like me getting five 5 gallon bucks and throwing regular, mid, premium, #2 diesel and offroad diesel and then shooting a roman candle at each one to show which ones burns better."