"vortex2" wrote in message
...
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


For those who have pointed out the blindingly obvious - yes I know it does
cost more!

I should point out the manual for my car says:

"The engine can be driven witht he octane ratings 91, 95 and 98 RON."
"98 RON is recommended for maximum effect (sic) and minimal fuel
consumption."

If I see 4% less fuel usage then I have a neutral cost for using
superunleaded.

David