Thanks. I think it must be the EtOH. My mpg calculator in the car doesn't need me to plug in how much gas is in the tank, it calculates fuel burn constantly when the car is running, down to the last drop of gas and so knowing how much is in the tank is not relevant. Before my fill up, I was averaging 23 mpg for city driving. Right after fill up and through the entire tank I was averaging only 18.2 mpg for my same commutes. I keep a record in my car and my mpg had been fairly constant since my first tank of gas. It switched suddenly with my last fill-up. I am filling up today and we will see if it changes. I have 20,500 miles on the car and it was just in for its 20,000 mile check-up and tune up and my tires are OK and so I don't think the car's efficiency changed immediately following my last fill up. I still am betting that the gas is from a supplier that is dilluting it with something (or watering it down), probably EtOH as Emily has suggested. It still boils down to the same thing, not only have prices gone up but they may have gone up more than you think if they are diluting it... even if it is being diluted to a max level mandated by the federal government. I am getting less gas, or so my suspiscions still are. Thanks everyone.
