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So the slower your average speed is, the more wear and tear it is thought to have on the motor vs higher the speed? ie....29 mph vs 55?
What is an average mpg for a truck with over 200k miles?
To add to the above posts - idle time can contribute to slightly higher amounts of fuel in the oil (there is always a potential for small amounts of this even in healthy engines). If you idle a lot after first start, I believe it can generate soot. Not a huge deal, but it can affect things over time. These engines like to operate at the design temperatures (oil, coolant, transmission fluid, etc)!
Emergency service vehicles fall into this category by nature. As do utility vehicles with lifts that don't use a pony motor for equipment power. At idle and at hot temps, the low pressure oil system is also at a rather weak level compared to most engines. I would expect Nav designed around that but by nature it gives me pause.
A high hour/ low mile passenger vehicle engine indicates extensive idle time. Idle time is a cold engine bringing on wet stacking and oil dilution with fuel. Diluted oil gives you increased wear. It's said one hour of idle is equalivent to 25 miles of wear.
Ford recognized this and put out an announcement. See first bullet. There was another announcement about extensive idling but I'll have to search for it.
Not good - the whole of Europe runs on B7, which is more than Ford recommends. In 2020 it will probably go higher.
On the other hand 100k miles in 2500hrs is not too bad...