premium vs. regular fuel - BMW G310 R/GS Forum
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post #1 of 42 (permalink) Old 08-29-2018, 01:47 PM Thread Starter
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premium vs. regular fuel

The manual for the g310r lists both premium and regular fuel as options. OK to use either?
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post #2 of 42 (permalink) Old 08-29-2018, 03:39 PM
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I asked my dealer when I bought the bike. He said regular was fine- so far I have not had any issues using regular- 2,000 miles or so.
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post #3 of 42 (permalink) Old 08-29-2018, 03:43 PM
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The US manual for the G310GS says to use “Normal unleaded regular,” or 87 AKI. It also (confusingly IMO for us here in the US) lists the European numbers for their regular gas, 91 ROZ/RON. See the attached page from the manual below.

And according to the FTC:

In most cases, using a higher-octane gasoline than your owner’s manual recommends offers absolutely no benefit. It won’t make your car perform better, go faster, get better mileage or run cleaner.

Putting premium gas in this bike is just throwing away your money.
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post #4 of 42 (permalink) Old 08-29-2018, 07:32 PM
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US octane ratings are in RON, so when BMW says to use at least 91 RON gas, it's premium here. In Germany, that is regular. That explains why BMW calls it regular. They should just say to use at least 91 RON.



In the US, Shell V-Power super is only 92 RON. In Germany, it's 100 RON, and their normal premium is 95 RON.



Premium gas doesn't just have a higher octane rating. It also has more/better detergents and lubricants.

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post #5 of 42 (permalink) Old 08-29-2018, 09:04 PM
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Quote:
Originally Posted by mtwashington View Post
US octane ratings are in RON, so when BMW says to use at least 91 RON gas, it's premium here.
Sorry, mtwashington, we use AKI here in the US. But don’t take my word for it:

Does Europe Have Higher Octane Gas? RON vs MON vs AKI
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Last edited by WoodWorks; 08-29-2018 at 09:07 PM.
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post #6 of 42 (permalink) Old 08-29-2018, 09:44 PM
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Quote:
Originally Posted by mtwashington View Post
US octane ratings are in RON, so when BMW says to use at least 91 RON gas, it's premium here. In Germany, that is regular. That explains why BMW calls it regular. They should just say to use at least 91 RON.
In the US, Shell V-Power super is only 92 RON. In Germany, it's 100 RON, and their normal premium is 95 RON.
Premium gas doesn't just have a higher octane rating. It also has more/better detergents and lubricants.
Huhm actually US octane ratings are NOT in RON, they are in AKI (Anti-Knock Index), which is same as the average of RON & MON (R+M/2). If you look at the pump you should see the mention that confirms it uses AKI or R+M/2.

So 91 RON (used in most areas in the world) is equal to 87 AKI (used in the USA/Canada and a few more countries).

Now the real confusing thing about this is the fact that our manuals don't necessarily state the same thing as the BMW websites. If I read my owner's book, it says 91 RON ("Regular", 87 AKI at my local pump). If I go to BMW Canada's website, it says to use 95 RON ("Premium", 91 AKI at my local pump).

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post #7 of 42 (permalink) Old 08-29-2018, 09:45 PM
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A pic from the GS manual & a conversion chart for the different types of fuel ratings - see pics:
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post #8 of 42 (permalink) Old 08-29-2018, 10:25 PM
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Seem to be having trouble with above pic, trying again...
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post #9 of 42 (permalink) Old 08-30-2018, 12:11 AM
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Well I had that completely wrong, thanks guys for correcting me.
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post #10 of 42 (permalink) Old 10-01-2018, 03:51 AM
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If you look at the bottom of most major motorcycle magazine reviews where the specs are, you will notice that they give mileage figures for Regular / Plus / Premium fuels. Usually the higher the octane, the higher the mileage. You could calculate the best cost per mile by comparing your local fuel costs.


Unfortunately, they don't do dyno testing on the different fuels to see what performance gain there is, if any. Would be a good article though.


I think the higher octane does give a little more response on a motorcycle vs a standard car due to engine design. I have a Ford Transit Connect with the 1.6L EcoBoost (Turbo) that can take Regular fuel, however, the fine print in the specs are based on the Premium fuel which I think all turbo engines prefer. I do notice a better performance when turbo engages when running Premium.


If I had a Harley or some other cruiser, I would just use Reg or Plus, but with a single cylinder or sportbike, I would only run Premium fuel. It is not like you are consuming a ton of fuel anyways so the $0.30/gal is worth it even if it is only a small gain. If you modify the bike with performance exhaust, PC5, and or airbox mod I would definitely use premium.

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