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Originally Posted by Red Slilvy
I have a 02 4.3 std cab short bed with a cover , K&N stock box filter, Gibson dual side sport cat back And a 5 speed and all I get is 21MPG. I seldom see 3K RPM. I'm looking for some low end power & better MPG. 20MPG isn't too bad.
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I forgot to mention that I have the K&N and have been running Mobil 1. I may have a Flowmaster installed next, they claim that helps. I have the automatic with overdrive and at highway speeds it runs about 1800 rpm.