I do about 4-5 miles a day. But like I say I don't use cheap rubbish supermarket fuel, I use the shell v power, which is very good for a car.Sorry I was meant to say I get 22 mpg local driving but I did get 41 mpg driving down to London.
They will both be low 20's but doing such a low mileage why worry? At least your not looking at diesel, they would soon be problematic driving in those situations.
When the rubbers on my Mark 1 went bad after 10 years I purchased new rubbers from the Lexus parts dept. At that time the clip came off the end and it was a case of feeding in the new rubber and replacing the clip, they cost about a tenner then. I don't know if it the same set up on my Mark 4 because the ones that are on are OK.