Gas may cost a tad more since the replacement (if one is added locally) will be ethanol, which must be blended in locally. The cost of adding MTBE was virtually nil.

You'll need to check with your state/county commerce dept to see what their policy will be- some regions have oxygenation requirements in addition to the old EPA ones, and will have ETOH added; other areas will do without.

Remember- the EPA removed the requirement to allow suppliers time to adjust in their own way to the upcoming low-sulphur and virtually mandatory ethanol-blended fuels that are coming in the next year or so. So in the short term some areas will not have oxygenated fuel but after a year or two the fuel is supposed to be even 'better' than the old RFG. I don't know the specifics offhand, but cruise theEPA site and its all there.