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Sorry, personal hot-button for me: VTECH is a crappy phone; VTEC is Honda's "pick your cam profile on the fly" system.
The VTEC controller probably will not do much if anything to help your FE. You should be keeping the RPM as low as you reasonably can, not going over 2500 RPM unless you absolutely have to. The VTEC activation point is above that for just about all VTEC-equipped cars, as far as I know.
First steps: Slow down to the speed limit; speed kills economy.
Don't rev the motor. For "normal" acceleration, I shift at 2000-2200. I only get to 2500 RPM on the freeway because my 5th gear is very short. Cruise in the highest gear you can at the lowest RPM you can stand (without lugging the engine).
Drive as if you didn't have any brakes. Leave lots of room in front of you and anticipate conditions so you never have to touch the brake pedal. Every time you brake, you are throwing away momentum, which means throwing away fuel.
Driving habits can make for larger changes in FE than any car mod short of changing cars all together.
-soD
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