Ever since I bought this car a couple of months ago I been getting bad gas mileage. The car has just about 103000 miles on it now. The last time before I filled it up, I tried to ride it out as long as I could and it did something weird. The "Low Fuel" light went on and the meter was nearly on empty, I was on a side street at the time but after I turned onto a main street (from 25 to 40) the meter went back up very slightly and the Low Fuel light went off. The time I went to fill it up, it had around 160 miles (off a full tank). That's something like 10 mpg and I'm thinking I should at least be getting 5 more miles per gallon. It's a '99 V6 Automatic. The previous owner told me he only filled it up with premium gas while I've only been using regular (if that I has anything to do with it). I'm not a car expert and was wondering if I could do anything to fix this. Thanks in advance.