The gas mileage in my 2006 100 series has been getting progressively worse over the past couple of years. My commute is relatively short and all in town, but over the past few months I've averaged 10.4 mpg. I can get around 10.6 if I am very mindful of my right foot. The truck has 130,000 miles on it, and I do perform regular maintenance. I plan to clean the throttle body and MAF (last done approximately 15,000 miles ago, which was also 2 years ago). Any other thoughts as to what could be causing the terrible mileage? Around 2.5 years ago when my I started my intown commutes, I was around 12 mpg. Thanks in advance!