gas, different octanes.... Options

[celicarocker]

i put 87 octane in my car.... what will i get from switching it to 93? besides about $3 more

[mikeh117]

In the UK normal unleaded fuel is about 95 RON with 'super' fuels offering 97-99 RON. I always use a higher RON fuel as there is a small but noticeable difference in engine performance. I don't know if the car really accelerates faster or has higher torque but it certainly feels smoother.

Some info about higher octane fuels in the UK (Shell Optimax, BP Ultimate etc):

"Designed to clean your engine as you drive. It helps remove deposits on inlet valves and ensure fuel injector nozzles are kept in tip-top condition. This is one of the reasons it can begin to improve your vehicle’s responsiveness from the moment you use it."

"Can be mixed with all unleaded gasolines, but you’ll only reach its full potential if you use it all the time."

"It is well known that lack of deposits improves the efficiency of the engine, so using it should help fuel economy when compared to regular unleaded fuels."

However it does cost about 6 pence per litre more (about $0.40 / gallon).