Yep my tank is about that size 93 litres (BMW X5 4.4l), luckily old enough to be on the lower tax rate £280 I think. I can remember when petrol was 3/9 a gallon, in new money that is around 4.2 pence a litre, But But I think my take home pay then might have been nearly £4.00 a week. Mighty glad that I stayed with the RAF for 37 years for quite a nice pension, certainly wouldn't be running the X5 without it.
Syd