So I have a 2006 Pontiac Grand Prix with about 75,000 miles on it. I keep up with my maintenance regularly like oil changes, changing the oil filter, and keeping the tires balanced. But lately I've been noticing that its burns alot of gas. I'm not a speeder but I do live in Ohio with the winter weather I do constantly use my heat. So I'm not sure if its because I use the heat or is it something else I can treat my car with and have the gas mpg boost?