Based on my current gas mileage compared to newer trucks and using what I see as average gas prices locally, my current potential gas savings is around $ 100 / month. (biggerpockets.com)
Average gas prices in Iowa are up 28 cents from last year's average. (gobankingrates.com)
Illinois» highest recorded average gas price was $ 4.32 in May 2011. (gobankingrates.com)