Thiis is AWESOME!!! I have
Thiis is AWESOME!!! I have not checked them all but I drove a Ram 1500 for 200k and now am on a 2500 diesel. Both are consistent at 10-12% below what the dash says. My last trip I just filled up 5 times on a 2400 mile trip and the dash gave me 25.1 but the actual by way of a calculator was 21. Over my gas and my diesel watching closely for a very long time I believe they are calibrated at milage plus 20%