Engine hours
 

Are the engine hours logged in the DME?

Yes! If you multiplied the hours by 30 it should give you an approximation of the mileage in miles and multiply by 50 for kilometers….

Which obviously must be based on a 30mph average I reckon.....

I actually think that it's closer to 34 -35mph to get you in the ballpark. Based on the number of ECU that I have seen/tracked.

Total engine run time is logged and available when the DME over rev counters are read.

If you have the total engine hours you divide this into the number of miles and this gives you the average speed over those miles. I was told years ago that 30mph is about "right". Higher could be a sign of a car spending lots of time on the track, especially if there was not a lot of miles on the car.

A lower number suggests a garage queen, make that a boulevard cruiser.

At some point low average speed could be a clocked car.

About that 30mph average speed: Now I was interested in my 2002 Boxster with its big miles, I forget at what mileage I did this but I had the total engine run time read and I did the math and the average speed was very close to 30mph.

Now I had expected that with big miles -- accumulated for the most part with a lot of highway driving -- the average speed would be higher, but it wasn't.