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Hi Rich, welcome to the LOC. Always a good feeling when you manage to do your own repairs....and save a small fortune!

You got it....the car is at too low revs. When i had a 220d I could only use 6th when doing more than 85mph Only ever used it in France. Stick in 5th at 70/75mph and all will be fine.

Indeed. It's all about going in to a purchase with your eyes open knowing as much as possible about the car in question. Stuart

Here you go, and welcome to the forum. http://www.lexusownersclub.co.uk/forum/topic/95155-hello-and-also-unoriginal-ls400-vs-ls430-question-from-a-new-member/

I'd try cleaning the MAF sensor. Do you have any documented service information, do you know if the oxygen sensors have ever been replaced?

yes, 13-14 mpg is a tad low even in the cold and driving around town. I assume your GS is the same as mine was and the mpg resets everytime you fill up. If you fill up when the engine is cold the average starts very low and, in my experience, stays low - very low. I know it sounds like nonsense but if you fill up with a warm engine prior to a decent run then the average starts high and stays high - well highish. Keeping the car in the garage makes a huge difference this time of the year. The good thing is that petrol is relatively cheap these days.

Shame that mate, but it might be worth posting on the IS forum about this......only ISF owners here (the V8 one lol).