I have a 1997 LS400 and have done about 4000 mls since I had it. I fill the tank from empty, costs about £70-£77. I zero the clock every time, (old habit from company car days) I get 30 mpg on a run and I get between 23.5 lowest to 26.3 highest around town. I usually drive it like a Lexus but I do like to sort out a few wanabees from time to time lol. Every time I give some1 a lift they love it, makes u feel great.