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A Z71 Tahoe with some minor modifications that helped in performance and fuel economy. Now I get about 20-21 mpg on the highway, and was rated for 16-17 mpg from factory.
Engine/Drivetrain Modifications:
K&N CAI, Flex-a-Lite Monster Elec. Fans, Fitch Fuel Filter, EBC Yellowstuff Brakes, Black Bear 93 Tuned, B&M trans cooler, Engine FilterMag, Trans FilterMag, Synthetic oil (all around)