Hey guys just joined the forum and I just bought a 2016 Diesel summit. I got about 2,000 miles on it. I drive about 3 miles to work everyday(one way). Im getting way below the stated average for fuel mileage 15.8 in my small city. I have been paying closer attention to the gauges more now that i am learning the car a lot better. I have noticed the my temp dopes not want to go above the quarter mark. Even after a nice 15-20 minute drive. temps are not super cold between 30-50 degrees F. I'm thinking it could be a stuck thermostat or something. just curious to know what everyone elses gauge are doing?