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the biggest difference to mileage is to moderate your right foot. now for other things you could try to improve the aerodynamics of the truck, like the front grill, is usually a huge wind brake, there have been tests that show that putting a "bubble" nose can reduce drag considerably. also the back of a truck is a horrible turbulence area. Having the tailgate up is better than down (proven time and time again) but the best aero is gained from a slope back cap (think back of a humvee 4 door). for the rest of the truck, minimizing the size of the mirrors, or getting better aero mirros can help. Also the area around the wheel well can be a large drag area, minimizing it can help considerably. For tire drag, if you don't offroad much, going to a narrower "Highway" tire can help reduce rolling resistance considerably. there have been people that have swapped to a smaller injector without changing the computer, this WILL MAKE THE ENGINE RUN LEAN, did i say that loud enough? THIS WILL MAKE THE ENGINE RUN LEAN. but with high enough octane fuel (think ethanol) you can get away with it. Note: this will also lower the power of the truck.

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Q: How can you improve the gas mileage on your 2005 Silverado Z71 with a 5.3 liter with an average 16 MPG local driving?
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