Originally Posted by ticki2
You might want to check the DIC by hand calculating . Some are high and some are low , mine is 2mpg more than actual .
I've checked mine on numerous occasions and it's been dead on! Acturally sort of scary. Lately, I've been able to routinely get 20 mpg for several hundred miles running on the flat - but I've never-ever seen 22! I'm probably a lot heavier than others - at 8,400 lbs without the trailer. That best mpg figure is also based on running about 60 mph. Overall, and with a lot of hills and mountains, I probably average about 17.5 mpg solo. The mpg average overall (---over 50,000 miles) is right at 14 mpg on the DIC - which probably includes about 35% towing.
I didn't realize this was so far off the topic of cold-weather and diesels! Sorry 'bout that.