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- May 22, 2011
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Another big contributor could be idle time. I know that I have been letting my truck warm up in the mornings for 10-15 minutes before I leave. I also have a 1200 RPM high idle installed that kicks in after being on for a minute. That kills my average MPG pretty quickly, on top of my heavy foot and winter blend fuel.
For example, I hand calculated 15.8 MPG in my last tank of roughly 350 city & highway miles. The computer told me I did 17 MPG.
Today I did 20.9 MPG according to the computer all highway driving between 70-76 MPH. Which is probably more like 19.5 MPG if I were to hand calculate. (I did the weight loss, have intake, and custom tune running in the hottest setting)
idle time is a BIG one . kills mine.
