If you’re going to go through the steps of having a warning and reminder system. Why not just have a gauge? My DIC will tell me when my fuel is running low, but also gives me a gauge. Added that GM throws the “only use ac-delco def” but I have to order it for my convenience because my dealer charges $20/jug versus 12.50-13.00 from amazon. Yes DEF is available everywhere... as is gas; however, there are plenty of places I wouldn’t trust buying fuel for my ex wife’s dads lawn mower. Sent from my iPhone using Tapatalk