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Look IT"S YOUR TRUCK. It's what you like to drive Don't let anyone change that there are multiple people on here who have trucks and get great mileage out of them and still tow and use them as proper trucks. Just Do the best you can with them. Those silverado mufflers are Huge and heavy, Get a smaller mufller Aftermarket Magnaflow or flowmaster or something. I'm NOT claiming you'll get better FE from the flow but you will save weight not to mention you'll be able to form your Belly pan easier that way, Keep your tires as high PSI as you can to bring down rolling resistance.
Make sure it's tuned up and running properly. You're already going down the right road looking into all of the Aerodynamics because that's where Alot of the gains in a truck are.
I didn't see Did you already say what rear gearing you were running? because there's a bit to be picked up there as well if your gears are more agressive than you need
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Tank:
(No actual EPA numbers for car just used F/E numbers when i first got it)
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