It stalls and sputters down the road and I have to add gas additives almost daily to get it to run. I'm in Massachusetts for a contract, and I am almost certain my problems are due to the gasoline out here. I found a few sites to back me up.
It's not worth it to me to buy 10%ethanol gas if my car stalls non-stop!
http://www.jwardell.com/mini/2006/06/27/ethanol-gas-problems/Gas station’s tanks may not be completely sealed, and heavy rains may get water into the tank–and we all know New England has had record rainfalls this spring. In fact it is normal for stations to have water at the bottom of their tanks, but remember
gas won’t combine with it so it doesn’t get pumped, until ethanol is added and absorbs that water. The only way to avoid this is at the beginning of each summer when the switch is made to E10, the station must flush and clean out its tanks. You know most stations won’t bother doing that. As a result of all of this, the actual concentration of ethanol going into your tank may be much higher than ten percent–you have no way to tell–and you have no idea how much water is absorbed in it as well. It should be worse at the beginning of the season or after a lot of rain, then slowly improve.
http://www.aa1car.com/library/us10325.htm"Reformulated gasoline" (RFG) is now required in many urban areas to reduce air pollution. RFG requires extra refining to remove aromatic chemicals, and uses higher amounts of "oxygenates" such as MTBE, ETBE or ethanol alcohol. This raises the cost of RFG 2-10 cents a gallon and reduces its energy content about 1-3%. But the EPA insists the benefits outweigh the tradeoffs.
There is some evidence to suggest that RFG doesn’t keep very well if allowed to sit in a vehicle’s fuel tank for long periods of time (say 8-10 days or more). According to one engine builder, the ingredients separate and absorb water, which can lean out the fuel mixture excessively and cause driveability problems. Vehicles that sit unused for long periods of time, therefore, can benefit from a dose of fuel stabilizer in the gas tank.
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Dirty Gas
Another problem you may encounter from time to time is gas that’s been contaminated with dirt, water or other liquids. Many filling station pumps have a filter that keeps dirt and corrosion that has settled in underground tanks from getting into their customer’s fuel tanks - assuming they maintain the filters properly. But these filters won’t remove water.
Alcohol attracts water, and if there’s enough water present it can make the alcohol separate from gasoline.