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While I agree on the highway mpg similarity between auto trans with lock up torque converter and manual trans with same overdrive ratio, my torque converter was slipping and it was actually cheaper to do this swap than repair the auto trans because of my scrounging/fabricating.
The 20.4 mpg 300+ mile baseline trip at 70mph was with a slipping torque converter.
Also the manual trans gives me the option of going slower in direct drive for an efficiency bump, and at city speeds the 6 speed manual should win.
Any input on order of operations for my proposed mods, after finishing trans swap? The goal being to go from greatest %mpg increase/$ to least of course.
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2007 Silverado 3500 classic duramax diesel, Allison 6 speed auto, extracab long bed. Doing head gaskets, will probably do econo tune and aero mods next.
Mad max would have driven a metro
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