G Nack 37s

93 always

MechE

Thank you John.

chasemyaccord

iTrader: (2)

91 since I can't go any higher...unless I get 100 at a place near my work, but why in the hell would I do that hahaha.

911turbo

iTrader: (3)

premium shell only, unless i'm out in the boonies lol

BOXER83

iTrader: (2)

It's tell's you in the manual premium gas only

BOXER83

iTrader: (2)

The RPM rev too high not to use 93+

juicybusa

In general just the opposite is true- the higher the rpm the less octane required.

ShyTown91

iTrader: (1)

why not get 93 instead of 91? usually its only .05 more expensive thats 1 dollar for every 20 gallons

Chekov

(Sigh) Some posts here are as misguided as past threads on this often-repeated subject. Higher octane beyond what is required to prevent detonation is a complete waste of money, for higher octane in this range does not give you any more power or performance.

For those so inclined, you might as well open your window as you drive, throw out a dollar bill every few miles, and shout, “Veroom, veroom.”

DashKid

iTrader: (2)

i follow the manual it says 91 or better but in TX they only have 93,89,87

Chekov

In your case using 93 is preferred over the 89, because some performance may be lost as the ECU retards the timing to prevent knocking. However, if you want to take the trouble, you could combine both 93 and 89 when filling up to get close to 91, which is all you need.

joey_v

I'm kind of stuck because my choices in Chicago are 93 and 89.... maybe I should do half and half to hit 91 and save?

BOXER83

iTrader: (2)

Then why do they run a higher octane for crotch rockets, ferrari, lambo, and all the supercars????
I run 93 in my bike andis maditory

Chekov

Because those engines have much higher compression ratios than ours and need higher octane to prevent detonation. Where the G37 is around 10:1 a typical Ferrari is 12.5:1 or more.

Mike

iTrader: (1)

compression is only one part of the equation.

You could make just as much power on lower octane reliably, if you were willing to spend the money on a Motec.

If you can't pay, don't play. Put in 91. Premium car, premium maintenance, premium fuel, and of course, premium price.