hi. i have a audi tt lhd.225 plus its superchipped ..only had the car a month went from a porsche 944 cabrio that i had for 10 years. very impressed with the tt.. but ! here we go couple of things. the fuel gauge reads half full but its realy empty..! any ideas.. the other prob is that when iam on the motorway and in say 5th or 6th. i put my fot down to go from say 70mph upover the car seems to fummble for around 3 secs then away it goes. you can feel this throughout up to 95 then 100 etc . just now and then a fumble in acceleration. if you take of from 1st go up through the gears hard it does not do it. also over 70 the esp lights up..as iam a neewbie any info would be great. i have been told to run on optimax for a while and that it takes a couple of fill ups for the cars ecu to be happy with the change to optimax. ! i have had maf changed plugs air filter .. cheers kirk