Got me beat. My city/highway average is 16 or 17 with a 4.3 with cold air intake, flowmaster, all synthetics, and the tb mod.
'00 Silverado 4.8L (Gone) '11 Silverado 4.8L Originally Posted by RUFFNECK ...First relieve the pressure before doin' that or else you will get a nasty squirt and may get in ur eye.
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