Octane
06-13-2018, 05:08 AM
#42
AudiWorld Senior Member
So help me understand then, what is the purpose of even making higher octane fuel. For older "luxury" cars?
06-13-2018, 05:10 AM
#43
AudiWorld Senior Member
Is the myth actually true that higher octane fuel will yield better mpg?
06-13-2018, 05:50 AM
#44
AudiWorld Member
Any automotive engineers or designers weigh in? The people that actually make and test engines and cars? To the extreme, I'm sure there's a reason that Formula 1 racers don't use 87 octane fuel. If it was a good thing to burn the cheapest gas available, I'm sure Audi would be all over that in billboards worldwide, in big red letters. Or is there a global conspiracy by high end car manufacturers to support the petroleum industry? Other than their obvious interest in having consumers continue buying cars with gasoline engines in the short term.
Last edited by Doc H; 06-13-2018 at 05:54 AM.
06-13-2018, 06:22 AM
#45
AudiWorld Member
Join Date: Jul 2016
Location: Houston,TX
Posts: 176
Likes: 0
Received 0 Likes
on
0 Posts
06-13-2018, 06:36 AM
#46
AudiWorld Member
Join Date: Jul 2016
Location: Houston,TX
Posts: 176
Likes: 0
Received 0 Likes
on
0 Posts
It has nothing to do with luxury cars. It has to do with the compression ratio. There is plenty of information on this sort of thing. I posted a few links. If you are not racing your car you don't need high octane fuel.
06-13-2018, 07:20 AM
#47
AudiWorld Member
The semantic key in the conversation is related to whether the manufacturer recommends premium fuel or requires it. Audi's service manual for the (new) Q7 states it recommends it. With lower octane fuel, slight loss of power (maybe), poorer performance at high speed or towing (maybe). Long term effects on engine wear (maybe). You pays yer money and you takes yer choice.
06-13-2018, 08:29 AM
#48
AudiWorld Member
Join Date: Apr 2018
Posts: 57
Likes: 0
Received 0 Likes
on
0 Posts
The semantic key in the conversation is related to whether the manufacturer recommends premium fuel or requires it. Audi's service manual for the (new) Q7 states it recommends it. With lower octane fuel, slight loss of power (maybe), poorer performance at high speed or towing (maybe). Long term effects on engine wear (maybe). You pays yer money and you takes yer choice.
06-13-2018, 08:42 AM
#49
AudiWorld Member
It would have to "recommend" and not "required" - You could be in this scenario where you are middle of nowhere and running low on fuel, and the only station you can find has regular (believe me i've seen this few times) what option do you have? I hope that my $65K ride can accept regular as the interim until I can find Premium.
06-13-2018, 08:42 AM
#50
AudiWorld Super User
Yep, the engine mfr recommends 91 AKI gasoline or better.
Yes, some manufacturers require a premium grade of fuel.
Fuel quality is variable around the globe - - not all have access to the quality of fuels we have in the USA/Can, etc. The cars have to be able to run on lesser grades of fuel. These cars will be at their best when using the recommended fuel. However, many are not tuned into their cars and will never realize a difference.
Yes, some manufacturers require a premium grade of fuel.
Fuel quality is variable around the globe - - not all have access to the quality of fuels we have in the USA/Can, etc. The cars have to be able to run on lesser grades of fuel. These cars will be at their best when using the recommended fuel. However, many are not tuned into their cars and will never realize a difference.
Thread
Thread Starter
Forum
Replies
Last Post
Roughedgez
S4 / RS4 (B5 Platform) Discussion
3
11-23-2002 10:25 PM