[kwhitefoot]

> Though the mileage part is tricky as its going to be a cat and mouse game of fraud and privacy concern.

It's not a privacy concern. The mileage is already recorded as part of the periodic safety test, annually in the UK, every two years in Norway (and the rest of EFTA I think).

> Do your road repair money not come from fuel tax on hundreds of liters of diesel per fill?

No that goes into the general treasury funds, as far as I know. It's about 0.60 GBP per litre in the UK. Typical fuel economy gives about 3 km/l so a tax of 0.20 GBP per km.

UK HGVs travel about 25 x 10^9 km per year so the income is about 5 x 10^9 GBP/year. The UK spends over 11 x 10^9 GBP per year on roads, mostly maintenance, more than double the income from diesel fuel duty.