If you could get a wrecked Diesel-powered Mercedes-Benz, either a Sprinter van or some sedan, to take the engine for a swap into your Silverado, that would be a good option. And I'm also favorable to aeromods with fiberglass as pointed out by Viturro. You might have already seen those fiberglass front clips widely used in race trucks, lighter than their sheetmetal counterparts and often also more aerodynamic too...
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Originally Posted by UFO
Biodiesel. Better mileage, no petroleum. That's what my eco-conscience tells me.
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I'm also favorable to biodiesel, and even pure vegetable oils.
As far as NOx emissions while using regular petroleum-based Diesel fuel, some newer engines get lower compression ratios in the order of 14:1, which reflect into lower NOx amounts since the combustion goes slightly colder, such as the Mazda SkyActiv-D that's gonna be released in the American market soon. Surprisingly, this same low compression ratio which is often pointed out as "revolutionary" was also used in the old Cummins NTC-400 (Big Cam) engine...