What I'm seeing is maybe a 3-5% improvement over conventional MPI, not the huge advatage diesels have. They don't seem to have the big low-end torque that diesels have. That big torque is needed to push efficient gearing.
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2000 Ford F-350 SC 4x2 6 Speed Manual
4" Slam
3.08:1 gears and Gear Vendor Overdrive
Rubber Conveyor Belt Air Dam
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