One thing that would help is if states took the smog-reducing additives out of the gas.
Californias little MTBE experiment in poisoning the water table knocks about 10% off your vehicles mileage.
For about a 2% reduction in pollutants.
A 2% reduction in smog looks good, but at the expense of burning more gas which actually increases smog doesn't compute in my book.
Same thing seems to be happening here in N/W Arizona with methanol added to the gas.
Mileage went down 10% in all my vehicles a while back and in the last few months it's gone down another 2-3 percentage points.
State governments must have taken math classes that were way different from the ones I did.
I know . . . it's the old "You don't understand" bit.
Actually I think most of us understand all too well....