mpg on 13,14 and 17 CB1100

[Cormanus]

Shahyaan, what are the octane ratings in the UK? In Australia they’re 91, 95, 98. I know they’re different in the USA.

[GoldOxide_imp]

Your gallons are bigger and I THINK that they calculate the octane rating differently than we do.

Correct.

If we use the standard international system, then the conversions are:

1 U.S. gallon = 3.7 liters

1 British gallon = 4.5 liters

= = =

I think U.S. and Canadian gasoline octane numbers are the same. Typically at the Canadian pump they are:

87, 89, 91, and 94.

There are other numbers higher and lower, but they are not common.

[Tev62]

In Europe, the octane rating on the pump is simply the RON figure. America, by contrast, uses the average of the RON and the MON figures, called the AKI (anti-knock index). Thus, 97 octane “super unleaded” in Britain is roughly equivalent to 91 octane premium in the United States. Most petrol in the UK and Ireland only has 5% Ethanol but that is likely to go up to 10% in 2021/22. My poor old 1952 MG won't like the extra Ethanol but I did change the fuel lines from the pump to the carbs with modern rubber to mitigate that.

[shahyaan_imp]

Ah thanks for the information guys. Wish there was on standard be easier to compare

I believe we have 95 98 and 99 depending where you go.

It wouldn’t have an impact on mpg though would it?


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[Jfro5687_imp]

TBH I never quite know which fuel to stick in my bikes. I usually put in the ‘best’ fuel I can find (i.e. highest 99 RON something like Shell V Max) but I am aware that I might well be wasting money when I could put in the bog standard 95 instead. The bike does seem to run a bit smoother but it could easily be just a placebo thing. I don’t think many/any garages sell the 10% ethanol yet but I will avoid that for sure as and when it does. I don’t find the CB to be a thirsty bike so the mpg is not that important for me.

[Cormanus]

Honda says to run it on the lowest octane petrol. That’s good enough for me.

[redbirds_imp]

Always ran low octane, ethanol fuel and have never had a problem. Ethanol free has shown a very slight increase in mileage but not worth the added cost and not at all necessary for a fuel injected motor that Honda has designed to use ethanol fuels of 10% or less.

[shahyaan_imp]

Honda says to run it on the lowest octane petrol. That’s good enough for me.

I heard somewhere on this forum you could run it on chip fat or was that just for the crank case?

I haven’t really bothered with the higher octane on the Honda. Needed it on the Harley after the upgrade as it pinged like crazy in hot weather.


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[GoldOxide_imp]

RE chip fat - lol.

I experienced the CB1100 ran very well on regular octane (87 here in Canada) which can contain up to 10% ethanol.

The lump really put out without complaint.

[Houtman_imp]

I always use the highest Shell octane gas because of the better/more additives . Bikes and all my other gas powered equipment runs perfectly and if I waste money than that is ok with with me .