Why do people buy high octane petrol?

flibbage0 said:
Can someone explain to me what "retard the timings" means?
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The spark plugs fire earlier meaning the air/fuel mixture is less compressed. To much advance meaning the spark fires close the the top of the stroke increases power but will eventually cause detonation
 
Westyfield2 said:
Without going into the details some company's might be getting Super Unleaded by purifying their crude better, whereas others might be getting it by adding octane booster to their regular unleaded. The difference between this is not worth worrying about IMO.
Whereas the difference between regular and Super is, in a correctly mapped/CR car, worth worrying about.

The only thing I would say is that because of the reputation petrolheads buy their Super from Shell/BP, whereas Esso's average customer just buys regular... this can mean that Esso's Super is a bit older, been sitting in the tanks longer, compared with Shell/BP who have a higher turnover of their Super.
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What on earth are you talking about? What a bizarre post.
 
[TW]Fox;20543417 said:
What on earth are you talking about? What a bizarre post.
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Peerzy was asking about using generic Super Unleaded compared with the holy grail V-Power.

I posted that the difference between generic Super Unleaded and V-Power is "not worth worrying about IMO", and that my only consideration would be the garages sales of Super Unleaded as you don't want fuel that's been sat in their tanks for ages (average Esso customer just wants regular, petrolhead who wants every last drop of performance goes to Shell to get the holy grail V-power → Esso don't sell much of their Super).

How is that not relevant?
 
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[TW]Fox;20543281 said:
Really?





Terrible posting. To deny it is comical.
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Can you read? The OP was roughly this:

"I have a question. My understanding is as follows: X. Is X wrong?"

As it turned out, one of the assumptions within X was wrong, so I learned something. What doesn't help is you coming in later and moaning at me because I had the temerity to end some of my sentences in full stops rather than question marks.
 
Alibaba99 said:
That's a 16% increase. Unless your car is running on the det limit whilst cruising (unlikely) that would suggest a 16% increase in the fuels calorific value and everyone using super would also get massive increases, which just doesn't happen.
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Am I a liar then?
 
Maccy said:
Am I a liar then?
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No, but your change in fuel economy was not solely down to the octane rating of the fuel you used.

Unless it was on the exact same road with the exact same traffic conditions and the exact same speeds at the exact same moments with the exact same weather and wind conditions then it's incomparable data.
 
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