I just bought an older Ford F150 5.4L that cannot make 150k w/o rebuilding the valvetrain. No one is saying go back to those days of smog filled cities. I'm with the crowd that says we've accomplished a lot and are at the point of diminishing returns, i.e at what cost to get a small (1%?) improvement? The EPA (and state agencies) have gone way overboard on many fronts that affect us all on a personal level. Wetlands, for example. I cut every cat-tail I see on my property lest some bureaucrat come by and restrict my usage of said property.(quoted from post at 14:02:14 01/12/17) The environmental controls have allowed the engines to [b:43da90a7b5]run several hundred thousand miles with very little trouble[/b:43da90a7b5]. The engines used to get so dirty inside due to all the unburned fuel that they were very short lived. Spark plugs would last a few thousand miles before they became lead fouled.[b:43da90a7b5] I can remember choking in the city due to all the smog from engines idling.[/b:43da90a7b5] The cars rarely broke 20 mpg, now 30-40 is very common, due to the mileage restrictions.
I live rural, but travel to cities extensively, the impact of pollution is much more dramatic when there is a higher vehicle density, but the effects are global.
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