[patch] Add octane_92 to fuel preset

[Zverikk]

In Russia and some other countries fuel often comes in three octane numbers: 92, 95 and 98. So, octane_92 should be added to default presets.

[Zverikk]

Ticket #6943 has been marked as a duplicate of this ticket.

[Don-vip]

According to ​http://taginfo.openstreetmap.org:8002/search?q=fuel%3Aoctane#keys, octane_80 is almost as used as octane 92 and listed on Wikipedia (​http://en.wikipedia.org/wiki/Octane_rating), I'm adding it too.

[Don-vip]

In [4511/josm]:

fix #6944 - Add octane_80 and octane_92 to fuel preset (patch by Zverikk)

[rickmastfan67]

Why not also add octane_87 to the presets? It's the defacto octane here in the US as all stations I've even been at has it. Also, most have octane_93 as well. I'll double check the next time I'm at my local station as to what's the common ones are here in the US, but 87 should be added as well.

[Don-vip]

Well, there are 3 types of rating:
​http://en.wikipedia.org/wiki/Octane_rating#Measurement_methods

I assume the one used in OSM is RON (correct me if I'm wrong), as Wikipedia says it is "the most common type of octane rating worldwide". MON seems exclusively used by aviation. Now comes AKI, used by "Canada, the United States and some other countries, like Brazil".

According to WP, 87 AKI = 91/92 RON, 93 AKI = 98 RON.

I don't think it's a good idea to encourage the use of several tags meaning the same thing. In these cases, shouldn't octane_91/92/98 be used instead, and let renderers display the correct value according to country usage (i.e display raw RON value by default, and convert OSM RON value to AKI on a United States map) ?