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I get into a fair number of similar discussions 'cause I'm driving on the road with a tractor engine. The presumption (not unreasonable) is that my car poluutes worse because it meets agricultural standards, not automotive standards. They seem okay with the idea that a tractor might burn 1 gallon of petrodiesel for every 2 gallons of ehtanol feedstock harvested, and they can put those 2 gallons in their E85 Suburban and go 28 miles, but it bugs them that I'm doing my polluting on the road instead of out in a cornfield. Maybe they'll be happier if I switch to three wheels.
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