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Hatchbacks Volkswagen GTI Volkswagen GTI Fuel Problems
31 messages, Last post on Aug 19, 2009 at 5:57 AM
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Replying to: eldaino (Jun 11, 2007 6:53 am) "Do not use any fuel with an octane rating lower than 87 AKI or 91 RON. Using lower octane fuel may cause expensive engine damage may occur." Perhaps you are confusing the RON with AKI? RON is a European unit. In the USA we use AKI which is synonymous with [(R+M)/2]. Yes, a higher octane fuel will result in better performance of your GTI. But don't confuse performance with engine damage.
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Replying to: geeteeeye (Jun 11, 2007 9:24 am) |
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Replying to: geeteeeye (Jun 08, 2007 3:52 am)
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Replying to: eneko (Jun 12, 2007 11:21 pm) |
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Replying to: eneko (Jun 12, 2007 11:21 pm) Iso-octane (and other anti-knock chemicals) is considered an additive because it is added such that a specific "octane rating" is acheived, unlike the base blend of gasoline in which the specific blend of hydrocarbons is not as crucial. The octane rating of gasoline doesn't mean that the only anti-knock component is iso-octane, just that it has the same anti-knock characteristics of a reference blend of, say, 87% iso-octane and 13% heptane (to refer to an "87 octane" gasoline). This is what you were getting at when you said the octane rate was a reference to the proportion of different octanes in the fuel (but this is incorrect). Also, all gasolines in a high performance engine will "burn at the right moment." But a fuel with the proper octane rating for the engine means that it will combust when the cylinder is at its highest pressure. That's where you get your engine performance. Lower octane-rating gasolines will work fine, because the engine's computer will alter the timing so that it prevents any knocking.
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Replying to: 600kgolfgt (Jun 08, 2007 6:05 pm) I still use premium because a) my BMW requires premium and b) my SAAB engine runs a lot smoother and quieter on premium. |
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Replying to: geeteeeye (Jun 13, 2007 11:07 am) "VW requires premium-grade fuel for the 2.0T and recommends it for the V6." F.Y.I.
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Replying to: 600kgolfgt (Jun 17, 2007 5:38 am) "Test GTIs averaged 16.8-19.1 mpg with manual transmission, 23.6 with SMT, both in slightly more highway travel vs. city driving. VW recommends premium-grade fuel." |
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Replying to: geeteeeye (Jun 18, 2007 2:34 pm) That is a complete aberration. I drive my GTI hard at 4-5000 rpm every day. I get 25-26 mpg with manual transmission mixed city and highway. EPA figures are 32 highway and 24 city. The FSI technology used in the GTI makes for the most fuel efficient engines in present time. It is the most fuel efficient car in its segment
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Replying to: fasterthanyou (Jun 18, 2007 5:40 pm) just because your numbers and their numbers are slightly off doesn't mean its an 'aberration'.  its not a diesel you know.
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