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I am more of an engine and driveline guy, and I like the Cummins. The unfortunate thing is that Dodge and the other OEMs put final drive gears in the axles that are too numerically high for high mpg. Big Dave has a Powerstroke with 3.08s and a Gear Vendors OD along with mods that are in line with what you want to do. Do a search on this site and see what he did.
Bolt ons? A Smarty Programmer with a custom economy tune and a finding a way to get your cruise rpm down to 1400-1600 rpms.
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Volvo WIA42 VED-12 / 335 hp / 1300 ft/lbs / 9 mpg
Big n' Boxy, Never met a Hill it Didn't Like
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