Mine too, but my backups get into the 40’s, mid 30’s around town.I am thankful for that. I figure the 3500 will be lucky to hit 6k miles this year. It just rolled over the 5k mark yesterday. (I did squeeze a 17mpg out of it via lie o meter)Mine turned into a garage queen Sunday driver Rustproofing everything underneath for now. When I do use it I just go on the highway and let the engine reach its normal operating temp then head home and park it back in the garage. Glad I have a backup vehicle that gets 32MPG.