I have a 2000 sierra (rclb)1500 with the 4.8 and my friend has a 2000 silverado 1500 (rcsb)with the 5.3. His will pull a fuzz harder than mine, but mine gets between 18 and 21 mpg( usually 20) where his gets 16-18. We have the same mods and the same driving habbits and carpool so both trucks see the same type of conditions as the other.
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