Nick thanks for sharing - So am I hearing this right - you're telling me it's got a trip meter 😱 - Therefor no more sums to do using the odo to calculate fuel/miles remaining
Here's something - Add all the numbers together then divide by the number you just thought of and that'll give you the minutes of accurate reading time provided by the random number generator.
Alternatively use the numbers in the local lottery - see if that works 😜
I remember at last years MOT I couldn't get it to display mileage either then it got better & worked again. Stress related sickness poor thing