We recently traded our 2014 LML for a 2019 L5P. The 2014 had over 326,000 miles all towing in a hotshot application. We averaged somewhere around 700 miles per gallon on DEF with both a 2013 and 2014 LML. So far the 2019 L5P is drinking DEF to the tune of less than 200 miles per gallon. With less than 5000 miles on the truck we have already dumped in 30 gallons plus whatever the dealer had in it. The fuel tank was full, don't know about the DEF. Typically the FIRST indication of DEF level less than OK is around 130 miles. Never get an alert at 1000 or 250. I presume this is because it is going through it so fast. This just doesn't seem right to me.