How Can I Improve Chevy Silverado 2500 W/Vortec 6000 Fuel Mileage?

We own several Chevy Silverado 2500 with Vortec 6000 gasoline engines. Model years range from 2002 to 2005. We used to get 15 to 17 MPG.

Now we get 10 MPG. Any tips on how to improve fuel mileage and get it back into the mid-teens? While it might be nice to extend the fuel mileage beyond the original, I am simply trying to get it back to where it was when the vehicles were new.

We routinely use fuel injector cleaner. Sometimes this improves the mileage but the results usually only last for a few weeks. The results may be deceiving because we often use the cleaner right before a long trip.

These vehicles are usually driven an average of 30 miles per day. Normally these are highway miles with some city driving. Typically 2/3 highway, 1/3 city.

I believe that the intake filter has been changed but I will check it/them. Never thought of the exhaust issue. Sometimes these trucks are driven off road (construction) and it is possible that one or more of the guys hit something.

One of the ...

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