Anyone using high octane petrol and notice any benefits?

LightFlare

Used to use it on my highly modified Subaru, about 1 in 3 fill ups or prior to a long run

MPG was approx 10% higher on a long motorway run - but probably not enough to offset the added cost.

Was def noticeable if constantly using the “lesser” fuel

flaneurs_lobster

WellKnownSid said:

Car_54 said:

Gobsh said:

My Citroen is still in warentee and service centre is recommending fuel Additives???

Does the service centre happen to sell the recommended additives?

“Completely by chance, as luck would have it, we just so happen to have one extra large bottle in stock… which we can sell to you at the old price before prices go up on Monday…”

"SNAKE OIL, GET YER LUVERLEY SNAKE OIL 'ERE. ONLY A TENNER A PAHND"

Mildly_Miffed

Higher octane may have a benefit if the base ignition map and boost are set to take advantage of it - which few unmodified European-market cars will be.
If yours is one of the exceptions, then it'll generate more power at full throttle, when the boost and/or ignition would be pulled back to prevent pinking.
Whether you need more power while driving in a sensible manner on the road is a different question.

It's very unlikely to produce better fuel economy. If it does, that extra economy is very unlikely to outweigh the extra cost.

The differing levels of ethanol are mostly a red herring, unless your vehicle is stored over winter in a damp atmosphere with a fuel system that easily vents to the atmosphere (in which case, evaporation of the fuel will be a bigger problem). Every vehicle sold new in the UK or elsewhere in Europe since 2009 must be fully compatible with E10. Most older vehicles are, too - unless they have very low quality fuel hose, which should be replaced with better stuff anyway as age will have taken a toll.

Premium diesel provides zero functional benefit in any vehicle.