HORRIBLE fuel mileage

[Rawze]

(01-31-2023 )Redland1 Wrote:  Also noticed that the ambient temperature readings are off compared to what actual ambient temperature is.It’s 5 degeees Fahrenheit outside and the sensor is showing 72.

There is a high chance that the ambient temp sensor is disabled in the de-mandate program. turning it off in the program often yields a slight advantage on fuel mileage actually.

Having it disabled makes the engine use a more accurate measure of intake temps via the intake manifold temp and engine coolant temps for its offset.