02 Avalanche 5.3 mileage/tuning ideas
I just purchased a 2002 Chevy Avalanche, 5.3L vortec V8 with 50,000 miles, runs great but first tank it averaged 12 mpg/city, checked plugs and the gaps were around 60, so I replaced them and the wires with Bosch plugs gaped correct at 40 and replaced the air filter with a free flow K&N type, now I need to squeeze some mileage and a better burn, anyone tackle one of these for the mileage purpose? The only vehicle I have tuned so far is my 02 WS6 (5.7L) with the LTFT's off, I would think this would be similar, braf, maf, ve then maybe spark? Suggestions will be appreciated.