Thats a bit of a how longs a piece of string question, no one will have the same answer.
Depends on lots of variables, distance, speed, types of road, using the full performance at every opportunity, using it everyday all year round, weekends only, main car or second car, If youre worried about running costs go for the diesel if youre doing over 14000 a year.
Being a bit data obsessed I log my fillups, costs and mileage. 2012 to date "real" MPG is 32.00. Best tank was 36.79 and the worst 28.55. Computer in car says 36.2, but I don't think it has ever been reset from new, and the previous owner was definitely not an enthusiastic driver.
I am also looking at getting a 2007 onwards cooper s. I am running a 3.2 V6 TT at the moment so the above figures are like music to my ears. The problem with the TT is that even with a light foot you are not going to get 30 MPG. At least with the cooper s it seems you have the choice. It looks like I may get 32 instead of 22 which Is a good gain. Also the tax seems very reasonable for a sub 7 0-60 car. Its a shame the soft tops stayed supercharged till 09. I wouldnt mind a turbo convertible.
When do they need a belt change? I hear this can cause horrific engine damage.
The main problem is the death rattle when cold. Some times it's a cheap fix with just changing the tensioner but sometimes the whole set up needs replacing eg. Guides, chains etc. that costs a fair bit. MPG is reasonable for such a quick car and to be fair the insurance ain't bad (post code dependent)
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