Out of complete curiosity I filled my car with 99 octane petrol at Tesco the
other day.

See http://www.greenergy.com/products/99_octane.html

99.9p/litre versus 95.9p for 95 Octane. Basically I suppose the same price
when measured in "pence per octane"

My car (5 year old Volvo) has never run better.

I've yet to see if there's an economy benefit (I'm sure there will be).

I'm nearly convinced. Is there any negative side to running higher octane
fuel in your engine?


David