The numbers that I have right now are: 10L/100km or 23.6 MPG. This is based on using 70L of fuel per fill up(I don't want to run the tank down too much in the winter and get stuck out in the cold.) I believe these numbers are not too bad. He is some background info for this data. I drive 100km return to work and back, 20km city and 30km straight highway. The temp right now is approx -25C average on the praires. It dipped down to -42C last week. I believe I get better mileage in the morning, due to my insulated garage upon start up(around -8C). My truck sits outside in the wind all day and I only have a oil pan heater, I plan on getting a block heater as well. I bought my truck in Dec 07 and the last owner said he put in synthetic oil(weight unknown). Next oil change I plan on putting 0w40 synthetic diesel oil. When i start the truck after work, it stalls about 3-4 times and I feel as if the truck is going to shake apart. For about two minutes my truck is a four wheeled smoke generator!!! It belches and farts out black smoke until it warms up abit, my truck likes the cold as much as I do. Any comments on this data would be welcome.