[SentraSE-R]

Darin, I'm bothered by your perception of the thread title as unnecessarily broad and inflammatory. I meant for it to be controversial and attention-getting. How about a compromise change to "The dirty cost of hypermiling," "The dirty cost of my hypermiling," or "The dirty cost of one man's hypermiling?"

Re: the Insight I comment, I lumped it with lean burn cars in general, and in error. CARB barred lean burn Honda models from sale in CA in 1991 because of their high NOx levels. As you correctly pointed out, the MT Insight I was ULEV, producing 50% of the NOx emissions of normal contemporary autos.

Mech, thanks. I appreciate your compliments and suggestions very much. I do average a relatively normal ~10k miles/year with the box, with several road trips/year. My xB is a closed loop fool. Once warmed up, it's virtually always in closed loop. 98% load acceleration? Closed loop. Pulsing after a 5 mile EOC? Closed loop.