Is high test really necessary?

Jordo! · 12-08-2013, 05:39 PM

Quote:

Originally Posted by andre12031948

I'm not cheap or anything & can afford 93 octane but I noticed in almost all cases that when you buy 1/2 tank of 93 octane & mix it with 1/2 tank of 87 octane you'll pay less than if you bought a tank of 89 octane, plus in the first case you end up with 90 octane & a cheaper price. Anyone that wants/needs to budget their gas money should do some quick math & maybe consider mixing octanes. This would work even better in a gas station that lowers their high test/premium price because lack of customers or whatever reason.

I noticed that cause I also have a 95 4 cyl. 240sx se & want to use something more than regular. So....

Here's the bottom line:

Transient modifiers, recommendations for other cars, and general (or even expert, as in the case of several contributors to this thread) knowledge aside: If you can't or aren't attempting to monitor/actively tune around knock for the specific engine unit in question, you are stuck hoping the "black box" of the ECU is compensating sufficiently if you are using an AKI below recommended levels.

The default would be to follow manufacturer recommendations, if nothing else, in order to preserve the owner's side of the obligations of the warranty.

Once the warranty's out (or if it was never an issue), you are on your own to do whatever you like, but hopefully logic, reason, (and ideally empirical data, if it can be obtained) would inform subsequent behaviors...

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