The tuners don't do much on gasoline engines.
On a half ton 4x4 you are probably fighting bad gearing, big aero dynamic foot print a big engine and a bunch of extra drive train losses.
Lean burn can give a 10% to 20% boost. At least that's what I was able to achieve with a carb. But implementation on newer fuel injection can be a little more difficult since about 99% of the truck tuner market is focused on more power.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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