I recently realized that the ECU calculated mpg isn’t what I’m actually getting when I manually calculate miles travelled per gallons consumed. The ecu is saying I get around 43 mpg when I’m really getting 37. I have a RB EVO installed so I expected the 37 mpg number. However I don’t see how it would affect the displayed mpg calculation. This problem effectively disables the range function. I have stock wheels/tires. Any ideas why this is happening?