If testing fuel source, I'd try any new sources for several tanks before … The most accurate 2015 Chevrolet Silverado 3500 HDs MPG estimates based on real world results of 1.3 million miles driven in 51 Chevrolet Silverado 3500 HDs. Most of our customers report 2-3 mpg fuel economy increases and much freer, quicker revving engine. Exhaust gas temperatures usually drop on average 150-250 degrees depending on the system. Use our handy tool to get estimated annual fuel costs based on your driving habits.
Gas mileage is notoriously poor on all trucks, not just Chevy’s and not just the 5.3 vortec. Even on the LBZ, one of the most durable versions of the Duramax ever produced, there is still room for improvement in the form of addressing the transfer case pump-rub issue in 4x4-equipped HDs.
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