Hello, I just purchased a 1997 taco as listed in the subject. I love it, It my 4Runner get along nicely. smile Anyways, I was told the gas milage is around 20-23 mpg new I am actually getting around 17 mpg any suggestions? (bad injectors?, wheel bearrings?, head/valve problems or signs of? timming belt and water pump was serviced @ 108,000 miles. Thanks