SAT for two hours. Probably a total of 30 minutes idle time. Temperature ranges from the low 30s to 11. Half hour of 10 mph crawl. 30 miles in 4wd @ 40 or so on various kinds of ice. Still managed 21.26 mpg!
1996 Dodge 2500 Cummins Turbodiesel
Custom cab, auto, 3.55 gears