Kenworth t680 12 volt or 24 volt?

The t680 with a Cummins I drove at Big G was a 12v system. Never saw a modern ecm controlled semi with a 24v, not saying they don't exist, but in 26 yrs, the only system I have ever seen was a 12v negative ground and 1 12v positive ground (old Mack pre-ecm)

 

Haven’t seen that since 1987, and it was 24 volt start, 12 volt run.

 

Notwithstanding that, how do you like your 680 overall? What kind of mileage you getting?

 

Don't go by the average fuel economy on your dash display, it's rarely correct. I come down 97 through central Oregon every week, about 315 miles and fairly flat most of the way. I always fill up at the PFJ in Biggs on the north end because it's cheap, then I top off in Klamath Falls on the south end before entering California. My display always says that I'm getting around 6.5 mpg along that route. But when I top off and calculate it out, I'm getting more like 7.6 to 8 mpg. On flat ground like on the I-5 through central California, I can get 9.3 to 10 mpg loaded. Deadhead I can get over 11 mpg. I'm driving a 2019 T680, Cummins with auto 12 speed.