My old '94 just keeps going about it's business, just turned 312,000 km.

I keep track of every tank of fuel and compute the mileage of each tank, and then again compute an annual average once a year, in August.

This last year I drove 34,837.6 km, burned 4,598.64 litres of fuel, which computes to an average of 21.34 miles per imp gallon for all combined driving.

I'm quite pleased with that, as fuel mileage is the primary reason I drive a diesel pickup.

In the 4 years since I have been driving this rig I have averaged 21.12, 20.98, 21.05 and 21.34, so pretty consistent.

Also has been 100% reliable, I replaced the glow plugs and injectors last year, and today am going to change the belt tensioner, the old one is starting to hang up, but have not had any sort of breakdown.