I think I know how/why the DIC fuel consumed was 1 gal off of real world. This GTP was driven by my daughter for about 3 years and she probably never reset the MPG portion of the DIC. She was probably getting better gas mileage then I did once I started hot-footing around after I reclaimed the vehicle from her. Once I read the owners manual I discovered the DIC uses the MPG calc to also calc the fuel consumed. So I realized I should try resetting BOTH the fuel consumed AND the MPG values during a gas station fill-up.
At the next fill-up after that, my real world gas consumed and DIC gas consumed values were within 1/10th of a gallon.
