> Some of these work, although early 70s models were jetted so lean
> (for the US market) that fuel economy actually improved by richening
> up a bit, allowing one to drive in a higher gear in many situations.
> 4-into-1 headers were worth a couple mpg too, as well as better top
> end, a rare change with no real down side.

My toyota celica, which I installed instant and avg mpg metering in,
got best mileage at 62, and benefitted a lot from shutting down the
exhaust gas recirculation and lowering the idle to about 700 rpm.
Stoplights and sitting in traffic is 0 MPG.
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