My girlfriend puts about 60% of the miles on the iS, and its stayed circa 39-40mpg average over the last 14000+ miles.
She did 350 of the miles on the 45mpg+ tanks, so can deffo P&G well.
She also keeps the reciepts for fuel and records mileages, plus helps service the car.
WIN!
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My Blog on cars- Fu'Gutty Cars
http://fuguttycars.wordpress.com/
US MPG for my Renault Clio 182
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