Mixing 89 & 93 octane, will the tank blend them?
11-09-2010, 05:11 PM
#61
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My original question was whether or not the mixed fuels would be mixed properly, not the practicality of doing so. ... but I appreciate your input!
11-09-2010, 05:13 PM
#62
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Back to the original question - Your state may not have a mid-grade gas pump, but they do in NC. Mixing the high and low is how the mid-grade gas is created and dispensed. It's mixed at the pump by drawing from both tanks - so obviously, no problem with doing what you are doing!
11-09-2010, 05:20 PM
#63
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Secondly, every car manufacturer on earth knows that there will always be people who use the lowest (and obviously cheapest) octane fuel they can find, regardless of their recommended octane "requirement". Think about that for a moment....no matter what they recommend or require, they know that there will be people who still use 87 octane fuel.
I noticed it was Regular, 87 octane, and asked about it. He said they use that fuel in all their test drive cars. I said "even those that need 91?" and he said "yes, they will all run just fine on 87".
When I took delivery of the G37 they said they would fill it up for me. I asked if they were going to use that pump around back behind the used car lot, and they said yes. I declined.
11-09-2010, 05:23 PM
#64
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11-09-2010, 05:24 PM
#65
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It's not just a question of saving money. It's a question of risk vs reward. If using the lower octane gas results in some detonation at some point and damages the engine, it's clearly not worth it. So the question comes down to how willing the OP is to take that chance. What are the probabilities that damage will occur with lower octane gas? There are a lot of variables to consider to judge that. I'd rather not roll the dice for a few bucks a year.
This has been clearly answered now, I'm good!
11-09-2010, 05:26 PM
#66
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OP: Why would you run less than the required 91 in your car? I don't think anyone is suggesting that.
11-09-2010, 05:27 PM
#67
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11-09-2010, 11:58 PM
#68
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OP's not talking about running the car with low-octane fuel. Many gas stations offer 93, 89, and 87. The engine requires 91 -- anything above that is superfluous. So he wants to mix the 93 and 89 to make 91.
11-10-2010, 12:50 AM
#69
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11-10-2010, 05:59 AM
#70
BTW, 100 octane fuel is usually very expensive and is difficult to find. Are you planning on doing this?
11-10-2010, 06:05 AM
#71
But the point is still valid--- under "normal" driving conditions, the majority of us wouldn't even wake the knock sensors up at all when we're driving. You can actually monitor this with a scan tool that has live data stream. You'd probably be surprised how difficult it is to actually get the knock sensors to retard timing.
11-10-2010, 06:09 AM
#72
Funny you bring that up. I bought my G at Sewell Infiniti of Dallas. When I was test driving different models (first the FX35 then an '08 G35, then a G37), they had to put gas in the G35. We (salesman and me) drove around to the back of the used car lot where there was a gas pump, and the salesman put in about 1/4 tank.
I noticed it was Regular, 87 octane, and asked about it. He said they use that fuel in all their test drive cars. I said "even those that need 91?" and he said "yes, they will all run just fine on 87".
When I took delivery of the G37 they said they would fill it up for me. I asked if they were going to use that pump around back behind the used car lot, and they said yes. I declined.
I noticed it was Regular, 87 octane, and asked about it. He said they use that fuel in all their test drive cars. I said "even those that need 91?" and he said "yes, they will all run just fine on 87".
When I took delivery of the G37 they said they would fill it up for me. I asked if they were going to use that pump around back behind the used car lot, and they said yes. I declined.
11-10-2010, 10:40 AM
#73
No, becuase the M30 was still pretty fuel inefficient in the context of other cars at the time. If saving money at the pump is a priority then a smaller car with a more fuel efficient engine is the best bet.
11-10-2010, 10:42 AM
#74
Several people are saying there's nothing wrong with putting 87 octane gas in a car requiring premium, the engine will just retard the timing. G37Sam is saying that it's silly to buy a sports car needing premium and then hamstring it by only buying regular gas.
11-10-2010, 10:51 AM
#75
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At low altitudes 89 should be just fine. 91+ is needed at higher elevations. That's all. Using low octane fuel such as 87 is asking for trouble in the longer run. Engine damage due to strong knocking may occur even with ignition retarding function. In addition, 87 octane fuel reduces performance which kinda defeats the idea of owning a performance car?