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Old 15th August 2009, 09:32   #1
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Default Are premium fuels Lighter?

I was tanking up when I noticed that the pump had density displayed for all four fuel dispensers. And the Interesting thing was that the density displayed for both premium Diesel and Petrol were less than those of regular. I thought due to the additives, it would have been the other way round. Or was what I saw a one off case ?
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Old 15th August 2009, 20:37   #2
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Since Octane ratng (the ratio of octane compared to a mxiture of trimethyl pentane and n-heptane ) is high for premium petrol, I expected it to be denser. So I think the additives might be the reason for its low density.

Also depends which regular fuels you were comparing with. Not all fuels have same density. They vary a little bit. Also check if it is really a one-off case. I too will check the same tomorrow in a fuel pump.
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Old 16th August 2009, 00:36   #3
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The so-called premium petrol does not necessarily have a higher octane rating.

Also, I believe the volume of additive used would be too small to make a notable difference in premium petrol.

Lastly, the definition of octane rating is a bit off the mark...
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Old 16th August 2009, 00:57   #4
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Higher Octane rating not necessarily, but they might right? and the defn well thats what more or less wiki says, but ya i typed it in a crude. The volume of additives might be small. So just wondering. what might have the caused reduction in density greenhorn is talking about..
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Old 16th August 2009, 12:08   #5
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If you look at the Euro/BS III specs premium should be 95RON minimum. So obviously the so called Premium we have is just with additives. This may be why IOC has stopped advertising XtraPremium as a Premium but just Petrol with Additives.
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Old 16th August 2009, 12:45   #6
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Quote:
Originally Posted by greenhorn View Post
And the Interesting thing was that the density displayed for both premium Diesel and Petrol were less than those of regular.
@greenhorn
Could you please mention the density of all four i.e Regular/Prem-Petrol and Regular/Prem-Diesel.

Quote:
Originally Posted by sgiitk View Post
If you look at the Euro/BS III specs premium should be 95RON minimum.
Sir could you please elaborate 95RON what does RON mean.
Thanks in advance
cheers
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Old 16th August 2009, 12:56   #7
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Quote:
Originally Posted by sanagg1 View Post
....please elaborate 95RON what does RON mean.
Please see this post for an explanation :
http://www.team-bhp.com/forum/17784-post7.html

Perhaps sgiitk can add to it.

cya
R
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Old 17th August 2009, 01:49   #8
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Quote:
Originally Posted by rageshgr View Post
Higher Octane rating not necessarily, but they might right? and the defn well thats what more or less wiki says, but ya i typed it in a crude. The volume of additives might be small. So just wondering. what might have the caused reduction in density greenhorn is talking about..
Not unless you are talking about something like Speed 97. Anyway, the octane rating differs according to area... so depends on your city, if it makes a difference.

Varying levels of adulteration might well be what caused the differing density.
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Old 17th August 2009, 06:47   #9
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Quote:
Originally Posted by sgiitk View Post
IOC has stopped advertising XtraPremium as a Premium but just Petrol with Additives.
This is how they sell their premium petrol at Shell too. The name used is "Super unleaded with additives" and "normal unleaded". When I enquired with the manager, he said both will have the same octane rating.
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Old 17th August 2009, 09:32   #10
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Premium in India is just unleaded + additives both in petrol and diesel. Hence there should not be any difference in Sp. gravity between the two varieties of fuel.
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Old 17th August 2009, 11:25   #11
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They may be light in density terms, but they are definitely lighter in terms of the density of your wallet.
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