Greetings from Arkansas

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I have an '06 Trailblazer and an '86 Silverado, and of course am always interested in safe'n'sane ways to keep efficiency up. In the past, just keeping out of the accelerator, I've been pretty easily able to beat the EPA ratings on my various vehicles.
As I use the TB for work, I'll be pretty conservative with what I'll try on it, but the Silverado is my tinker-wagon anyway, and I'm more comfortable wrenching on it.