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Have you got a B20B or E? The first thing for fuel economy is getting what you have tuned up & repaired. Electronic ignition isn't that helpful to economy when your distributor is in good nick, It's more of a convenience not having to change points. Having said that, the available electronic conversions are good at masking distributor problems, particularly if the points cam is worn funny.
Next on the list is an overdrive if you don't have one, then an improved exhaust, then a carefully ported cylinder head. Cool air isn't helpful to economy, but it is free horsepower.
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