@shovel--
Perhaps your car is better than average. Or perhaps your test results only show one specific set of circumstances, not all of the possible load/RPM/temperature/etc. possibilities. But I still think that the average current 40 MPG car puts out far less emissions per mile than the average 1989 40 MPG car.
@cfg83--it would be nice if that were the case. But there isn't enough $$ in it, and the regulatory hurdles would be immense. For instance, if my 914 were a 1976 model year one (and therefore subject to smog testing here in CA), I could swap out the old weird funky analog electronic fuel injection for a modern digital system which reduced emissions by 80%, and it would be labeled "GROSS POLLUTER" and I would have to put it back to its original more-polluting form to pass emissions testing.
-soD
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