Center of the Universe, Huron County, Ontario. Can | JC
Good question
We have dedicated trucks that test mpg
One is a benchmark used day in day out, have years of data
When we test against it, we know day in day out what the other one does,
Switch drivers 1/2 way, turn around, come back,
Chalk the tires so fuel in exact same spot at fuel island, hey a couple inches of can impact how much in tank,
We measure temp of the fuel,
It's a science.
Your comments are very valid,
Not uncommon to see 30% spread on mpg , same trucks spec for spec, just different driver.
As for oil temp, keep in mind high pressure fuel pump in isx is lubed by oil, not diesel as in DDC
As the ad used to say, it's not your fathers Oldsmobile ....
My 2 cents
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Oil temperature ISX.
