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We all know gas isn't the cheapest thing around but I would like some advice on which grade of gasoline I should use. I need to break in the engine so I'll be driving a lot in the 1st month. <p>I have a friend that has a 09 S40 & he put 87 octane in once but now I think he uses 89 octane. I don't just want to go for the 90+ if it isn't that much of a difference. <p>Please elaborate...
 

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For about $2 difference at fill up, I enjoy better performance and feel better about engine life. Also better mpg's.
 

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Re: What grade of gas do you use, what should I use? (USAF 2010 T5)

I always use 90+ Also, look for the tiny little sticker on the pump that says "10% ethanol". If you see that, then your only getting 90% gasoline. <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/mad.gif" BORDER="0"> The only brands that are 100% gasoline in our area are Shell and Chevron. I definitely notice a difference in mpg (for the worse) if I use the "blended" brands.
 

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<A HREF="http://www.ftc.gov/bcp/edu/pubs/consumer/autos/aut12.shtm" TARGET="_blank">http://www.ftc.gov/bcp/edu/pub....shtm</A><p>Check the owners manual. If you've got a T5, odds are you want the higher octane.<p>Basically, with these newer cars, the electronics can compensate for the lower octane by retarding the spark timing (and therefore eliminating knock), but you end up losing power and efficiency.<p>Bottom line: you save at the pump, but you're there more often! (And your car isn't as fun to drive <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/tongue.gif" BORDER="0">)
 

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Re: (StarmanDXE)

I use 87 octane, and have used 87 octane since the car was bought new. To experiment, I have put in 93 octane for a few tanks and have not noticed a difference in mileage and a slight, almost negligible increase in power. The way I see it, it's not worth the extra $$ as long as the car's not being raced.<p>Some supporting evidence, from Tom and Ray: <A HREF="http://www.cartalk.com/content/features/premium/myths.html" TARGET="_blank">http://www.cartalk.com/content....html</A>
 

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Re: (LennyQ)

Could be. If you're not making much boost, no need for the higher octane.
 

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Re: (mdms)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>mdms</b> »</i></TD></TR><TR><TD CLASS="quote">Diesel.</TD></TR></TABLE><p>My man <IMG NAME="icon" SRC="http://********************/smile/emthup.gif" BORDER="0"> <p>& what's the cetane number of the diesel you're using? i've been pumping Shell's V power diesel for the past few months "58 CN" and have noticed better performance and a quieter engine, consumption droped too from 6L/100km to 5.7 <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/cool.gif" BORDER="0"> <br>
 

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Re: (Guru)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>Guru</b> »</i></TD></TR><TR><TD CLASS="quote"><p>My man <IMG NAME="icon" SRC="http://********************/smile/emthup.gif" BORDER="0"> <p>& what's the cetane number of the diesel you're using? i've been pumping Shell's V power diesel for the past few months "58 CN" and have noticed better performance and a quieter engine, consumption droped too from 6L/100km to 5.7 <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/cool.gif" BORDER="0"> <br></TD></TR></TABLE><p>49 - 58. Depending on station (Shell / Neste Oil) and time of the year. Diesel ratings vary alot here in Finland since they need to withstand -40 Celcius during winter.
 

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Re: What grade of gas do you use, what should I use? (cmy4x4)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>cmy4x4</b> »</i></TD></TR><TR><TD CLASS="quote">I always use 90+ Also, look for the tiny little sticker on the pump that says "10% ethanol". If you see that, then your only getting 90% gasoline. <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/mad.gif" BORDER="0"> The only brands that are 100% gasoline in our area are Shell and Chevron. I definitely notice a difference in mpg (for the worse) if I use the "blended" brands.</TD></TR></TABLE><p>They only use 90% pure gas out here since it doesnt freeze .... So i dont get the choice <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/frown.gif" BORDER="0">
 

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Re: (mdms)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>mdms</b> »</i></TD></TR><TR><TD CLASS="quote">Diesel.</TD></TR></TABLE><p>hell yes!
 

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Re: (crossie)

umm isn't ethanol like 110 octane the stuff they use in racing fuel? I get happy to see it blended in my gas lol.
 

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Re: (PasS40ion)

Just put my second tank of gas in my 09 t5, 93 (r+m/2). Only really makes a difference when your under boost if I'm not mistaken. Mileage or power shouldn't be affected at low RPMs. Can we get an expert in here to verify this?
 

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Re: (PasS40ion)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>PasS40ion</b> »</i></TD></TR><TR><TD CLASS="quote">umm isn't ethanol like 110 octane the stuff they use in racing fuel? I get happy to see it blended in my gas lol.</TD></TR></TABLE><p>You're confusing octane rating and energy content. Ethanol has a higher octane rating, but an energy content that's 30% lower than an equivalent volume of gasoline.
 

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Re: (Munin)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>Munin</b> »</i></TD></TR><TR><TD CLASS="quote"><p>You're confusing octane rating and energy content. Ethanol has a higher octane rating, but an energy content that's 30% lower than an equivalent volume of gasoline.</TD></TR></TABLE><p>From what I quickly researched it's worse mpg but puts out better performance?<br>(not to mention more environmentally friendly)<p>Source:<br><A HREF="http://www.consumerreports.org/cro/cars/new-cars/news/2006/ethanol-10-06/tests-of-ethanol-vs.-gasoline/1006_ethanol_test_1.htm" TARGET="_blank">http://www.consumerreports.org...1.htm</A>
 

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Re: What grade of gas do you use, what should I use? (USAF 2010 T5)

The S40 is my wifes car. I fill it up for her and <I>secretly</I> put in premium (91). Ask her and its always regular (87) <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/tongue.gif" BORDER="0">
 

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Re: (PasS40ion)

Idk I usually run 91. But I notice a big difference between 87 and 93. The car is so much more responsive with 93 octane. That being said I get slightly better mpg with the 87 although that might just be because the car is slower on it.<p><TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>PasS40ion</b> »</i></TD></TR><TR><TD CLASS="quote"><p>From what I quickly researched it's worse mpg but puts out better performance?<br>(not to mention more environmentally friendly)<p>Source:<br><A HREF="http://www.consumerreports.org/cro/cars/new-cars/news/2006/ethanol-10-06/tests-of-ethanol-vs.-gasoline/1006_ethanol_test_1.htm" TARGET="_blank">http://www.consumerreports.org...1.htm</A></TD></TR></TABLE><p>Incorrect, its worse mileage and worse performance. If you had 100% pure ethanol you could advance the timing to amazing amounts, and get more power that way. However our cars are designed to run pure gas not a blend as such we loose all around.
 

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Re: (zerocover)

Your in Europe right?There fuel ratings are different than in the states but you want to run 91 or higher if you can with a turbo motor.I run 93 mostly but for a while when gas went to 4.00 a gal I ran 100 since it wasn't much more but the 93 give more mpg than the race gas.
 
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