+1..... Oh I completely agree with you. When I went to test drive the Nismo for the first time we had to stop & get some gas b/c it just got off of the truck a couple days ago. Well the sales guy only put 3-4 gallons of regular gas in it & was going to try to get reimbursed for it.

The higher the octane the slower it burns & the lower the octane the faster it burns.

Uh, a bottle of octane booster isn't going to do much, which is the whole point.

You're better off demanding to accompany them on the journey to the gas pump if you are that worried.

Or tell them not to bother filling it up -- you'll do that.

Failing that, if you are that concerned, drive around at fairly low revs, putting very little load on the engine (less load means less torque produced, means less likely to autoignite -- although it is certainly possible to knock even at idle), get through a 1/4 or 1/2 tank of gas and then top off with high test.

Or break out the siphon hose and start sucking :bowrofl:

The message I'm getting from people on here is that they don't trust car dealers as far as they can throw them (fair enough) but they DO trust snake oil salesmen selling unregulated, mystery fuel additives (why?).

I was just ranting about the dealers filling up with regular so others would know and figured since you questioned the dealers method was a good post to quote....but if I ever do buy a new car I might demand premium if not a gas card lol

As far as the difference a booster makes I am not questioning other than if I know regular was used I hope it helps, recently got my Z shipped and the shipping company put over 100 unexplained miles on the car and I filled it up and added a booster... good news is car drives great

+1....... I will agree that the SOB will put regular gas in the tanks instead of premium. What is this "snake oil salesmen selling unregulated, mystery fuel additives?" I have never heard this before & could someone please elaborate on this for me.

I'm being facetious -- I mean that the octane boosters are not regulated in any way shape or form, so use at own risk.

That said, I wouldn't count on them to do anything especially good OR bad (other than drain your wallet a bit).

Seriously, if anyone here buys their new Z and thinks the dealer topped it off with regular, the best thing you can do is drive around gently (i.e., no flooring it, no redlining it -- not a great idea if breaking in a new engine anyway...), burn through 1/4 to 1/2 a tank, and then top off with high octane.

Hell, if you can find it, some Sunocos have 100 AKI at the pump. Half a tank of that plus regular will get you where you need to be (although I believe fuel blending winds up being not quite that simple in terms of effective octane...).

That's a much better way to go than adding a couple bottle of octane booster, crossing your fingers, and driving however you would normally.

Oh, and lookie what I found... http://www.fueltechexperts.com/2008/...which-is-best/

Remarkably, a few of them added a point or two of RON (although, keep in mind that AKI is the average of RON+MON... actually, a good rule of thumb on RON to AKI conversions is RON*.95=~AKI value -- example, our car requires 96 RON or 91 AKI, 96*.95 = 91.2), most added less than a point.

Still not going to be very helpful on a tank of 87. Siphon or gently use up, top off with high test. Done.

Find a gas station that sells 100 octane race fuel. They are actually quite common. I tried octane booster and had no results. If you mix half race fuel and half 91 octane you get 95.5 octane. That seems to be the sweet spot for my 370z. I tried pure 100 octane but it didn't run as good as 95.5. There are many octane calculators online. You can mix 91 and 100 to achieve whatever octane you want.

:inoutroflpuke:

Holy necro-bump, Jamesb1.

Welcome to the forums?

Wowzers.. wat was the q again?..lol