I have a 940HPT.
Stage one to ensure the car is running right. Most engine mods, at least to start, concentrate on upping boost so won't improve economy.
My ranges between 40mpg on a long 60mph motorway run to 18mpg on short trips round my (hilly) town.
Decent super unleaded makes a difference. Not really done a lot of testing of that but I am sure it makes a few more mpg, more than 10% difference I reckon.
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