I find it useful to keep an eye on the state of the engine / vehicle. Otherwise I agree completely.I find it odd that you all talk in MPH and MPG.
My engine runs sweetest at between 2,500 and 3,000 revs,so that's where I drive.
I buy my fuel in ltrs and do most of my motorhoming outside UK,so I travel in Kms.
I reckon 600k to a full tank and that's it-I'm certainly not going to worry if it only does 580 nor jump with joy if it does 620. I wouldn't actually know
Fuel consumption of vehicles is a 'boy' thing that I've never understood-you buy the vehicle cos you want it ! what does it matter how much fuel it uses if it gives you enjoyment ?