[RWebb]

Thanks much.

I think our gas is less heavily regulated than in SoCal (we have no hot desert basin, and locally, our worst pollution (for many) is semi-natural (grass seed is grown here and the pollen causes lots and lots of asthma); with particulates (wood stoves) being the #2 villain). IIRC, we also do not have the extra regulatory step via CARB for SoCal.

I am a faithful cheap gas hunter for my DD (even caused an econ. prof. to wig out one time), but think I'll continue to try and use Chevron in the 911 (which has > 10:1 compression ratio). They just might add a little something extra and no regs. prevent them from exceeding the regs. for clean air.

Besides avoiding little used stations, I also avoid fillups right after the USTs get filled by a truck on the belief that it may roil the waters...