I would leave the El-Camino as a cool project car for the odd cruise, but that's it. The only way to ecomod one of those is to get rid of it and buy something newer and smaller. I highly doubt that cleaning up the underside will make any noticeable difference, as most of the energy waste in that car is in the engine. Old V8s are very efficient at converting fuel into heat and noise, not forward motion. I imagine a tiny 2-barrel carb, smog-sized valves and economy camshaft and a perfect ignition curve in a fresh rebuild might gain a few mpg. Not to mention a ridiculously tall axle ratio and lockup torque converter or manual trans. But at what cost?
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