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Make sure your thermostats are working properly, should get to 91ºc within 10 minutes or so and then stick there rock solid.
The 'stats on these are useless and fail so quickly, if it is dropping down to 80ºc at all then your car overfuels as it thinks it is cold still, think old school choke.
Tyres make a big difference too, I used to get 37-38mpg on my 17" wheels with Bridgestones I think it was, changed to 19" with Pirelli P Zero all season expecting it to get worse and it actually got better, went up to 40mpg.
I'm sure a super efficient 225/50/17 tyres would see even better gains.
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