On a nikasil engine with with 3 oil and filter changes,since I have had it, 1 set of plugs and a thermostat.....
I'm surprised it still moves to be honest!
Just done 123 miles up the motorway after gassing up, put in £13.69 (had used just over half a tank maybe more or less)
And filled up for £13.69
That's £0.089 a mile at £0.699 a litre still 3p less than when I converted
19.5 litres ( a full donut is 38 ish)
OBC showing 26.9 - creeping up after a lot of shirt journeys, usually reads about 10% high