Do diesels get worse MPG when below opeating temp like on a gas engine?

 

All engs gas/diesel are more efficant at a steady hot/warm temp , and diesels more so .
But on the other end its the other way , cool air for intake , beging last winter I put one of the big air filters with a blue page [ outerwears ] but no box/heatsheild , read that its better to have a little warm air inthe winter , now that its warm again I was woundering why my millage seemed a little low , then I thought about the heat sheild , and made one , again reading these sitez help you to either find out stuff or remind you about stuff .

 

Absolutely!
I am still leaving mine pluged in at night.
At a buck a litre I probably save a couple of litres on my way to work.
It probably costs less than a buck a night to plug the truck in on a timer for a few hours, plus less start up wear and tear.
These things take a long time to heat up, especially if you are not working them hard.
In fact, I think I will leave mine pluged in for a few hrs year round.
I think I may come out ahead, not sure though.
Also winter diesel= less MPG.

 

These dodge trucks we own. Do get bad mpg before they reach opp. temp. One of the reasons is they inject twice as much fuel when they are cold than they do when they are warm. Diesels for the most part are leen when they are cold and that is the reason for the added fuel when cold.