I just came back from a 500 mile round trip using my new Scan Gauge and it is so cool! Instant and average MPG that really shows how just a little lighter on the pedal can improve mileage. Intake air temp was another cool feature to see how it really does not cool off much at even 100MPH - with a metal intake tube and outside temp at 70, intake air stayer around 85-90. I can offer these for $119 delivered - plugs into ODBII port.