Following my OP and considering the answers given and the fact that nobody is screaming "don't do it" I have decided to try out the increased pressures. I'm driven by a mild disappointment in the mpg figures although it's early days for this car, i've only done approx 1000 miles and the engine is still loosening up I imagine.
I've filled up 4 times.
1st tankfull = 36 mpg
2nd tankfull = 46.5 mpg (this covered a 300 mile motorway / A road trip )
3rd tankfull = 41 mpg
The car is a 2.0 diesel Volvo S40 fitted with the PSA 136bhp engine as used in the Focus/309/etc. with a quoted manufacturers mpg of 50.
Jacks
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