How important is premium gas?
02-26-2011, 10:44 PM
#47
Ok here is the deal: You use 87, the car makes less power. To make it go fast, you'll have to push the pedal more >>> more gas.
Plus, the difference is so small, don't try to save $150/yr by doing this. You could skip a steak dinner or two a year and you'd be almost there. AND it's good for your health too!
Plus, the difference is so small, don't try to save $150/yr by doing this. You could skip a steak dinner or two a year and you'd be almost there. AND it's good for your health too!
Honestly not worth the savings, if you ask me.
As far as can the car run better with different octanes, its all in the fuel maps that Nissan/Infiniti installs. I know my old Accord only had a map for up to 89 octane, so using 91 was a waste (and it was unclear if 91 caused a failsafe and made the car run like it had 87). I dont know what maps are in the G, but Im guessing they have one for 91 octane. It would be interesting to know if it takes advantage of 93 octane or if 91 is the highest it expects.
02-27-2011, 03:01 AM
#48
I had an 04 G35. Manual called for 87 and that's all she got. Designed for 87 and you put 91, you're wasting money. THE END.
Scientist my rear end. 87 vs 91 octane will not boost your mileage. It is an AKI. Anti Knock Index. Federal Trade Commission reports state that using higher octane gas in your regular car does not improve gas mileage. Higher octane is only recommended for cutting down on engine knocking. Higher compression, higher octane. It has ZERO to do with freakin' fuel economy. Jesus, Mary and Joseph.
I use 91 octane in the G37 because the manual calls for it and I don't want my engine knocking when I stomp on the gas. That is all.
Scientist my rear end. 87 vs 91 octane will not boost your mileage. It is an AKI. Anti Knock Index. Federal Trade Commission reports state that using higher octane gas in your regular car does not improve gas mileage. Higher octane is only recommended for cutting down on engine knocking. Higher compression, higher octane. It has ZERO to do with freakin' fuel economy. Jesus, Mary and Joseph.
I use 91 octane in the G37 because the manual calls for it and I don't want my engine knocking when I stomp on the gas. That is all.
02-27-2011, 10:12 AM
#49
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I had an 04 G35. Manual called for 87 and that's all she got. Designed for 87 and you put 91, you're wasting money. THE END.
Scientist my rear end. 87 vs 91 octane will not boost your mileage. It is an AKI. Anti Knock Index. Federal Trade Commission reports state that using higher octane gas in your regular car does not improve gas mileage. Higher octane is only recommended for cutting down on engine knocking. Higher compression, higher octane. It has ZERO to do with freakin' fuel economy. Jesus, Mary and Joseph.
I use 91 octane in the G37 because the manual calls for it and I don't want my engine knocking when I stomp on the gas. That is all.
Scientist my rear end. 87 vs 91 octane will not boost your mileage. It is an AKI. Anti Knock Index. Federal Trade Commission reports state that using higher octane gas in your regular car does not improve gas mileage. Higher octane is only recommended for cutting down on engine knocking. Higher compression, higher octane. It has ZERO to do with freakin' fuel economy. Jesus, Mary and Joseph.
I use 91 octane in the G37 because the manual calls for it and I don't want my engine knocking when I stomp on the gas. That is all.
The knock sensor sends a signal to the ECM when it senses a knock and the ECM retards the timing to eliminate the knock. This does lower power and hence fuel mileage. In a G37, you WILL get better mileage using premium fuel.
02-27-2011, 10:22 AM
#50
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Actually, My Altima recommends Premium but can take Regular. I have tested it multiple times, with the same drive weekly and same driving habits, and every time I got better gas mileage on premium fuel. So, at the pump it costs more, but I went longer with premium so the actual costs were about the same (I think premium barely beat out regular every time). Plus, I had the added benefit of better performance.
I will not try it in my G as the manual state "regular in emergency," as someone else posted.
On another note, I hate when people don't take good care of their leases (proper gas and maintenance). I guess I just take too much pride to have someone else "stuck" with a problem in the future that I gave the car.
I will not try it in my G as the manual state "regular in emergency," as someone else posted.
On another note, I hate when people don't take good care of their leases (proper gas and maintenance). I guess I just take too much pride to have someone else "stuck" with a problem in the future that I gave the car.
02-27-2011, 05:16 PM
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8) Yes, there were so many holes in this "experiment" one could drive a car through it! I'll ask my wife if I can buy 6 G37s and drive each to CA. I'll let you know what she says.
I should note the car was a BMW and requested premium gas. It is entirely possible (indeed, plausible) that rather than receiving an efficiency boost in using 91 octane gas I simply avoided an efficiency loss caused by using 87 octane. It really isn't a controversial result to note you get better performance when using the kind of gas for which your engine was designed.
-Ed
02-27-2011, 08:08 PM
#52
Sample size and experiments aside, this is like using tap water instead of windshield washer fluid, and then whining when the nozzles clog up.
I've always followed the manual for every car I've driven since 1991 with no issues. This goes for fuel grade, maintenance requirements, oil SAE, etc. The engineers don't arbitrarily choose an octane rating out of a hat, and anyone that decides to save a few bucks per tank is losing horsepower.
I want every single one of my 328 hp showing up for the party. They were expensive!
I've always followed the manual for every car I've driven since 1991 with no issues. This goes for fuel grade, maintenance requirements, oil SAE, etc. The engineers don't arbitrarily choose an octane rating out of a hat, and anyone that decides to save a few bucks per tank is losing horsepower.
I want every single one of my 328 hp showing up for the party. They were expensive!
03-02-2011, 12:30 PM
#55
I haven't seen 93 anywhere in Cali. 91 is what most stations have for premium. I went to Costco to fuel up but saw the "10% ethanol" sign and left... well, the joke was on me because I did a little research and found out that "carb" (ca air resource board - a complete fuggin scam) requires ALL CA gas to contain 10% ethanol. Seems they used that to replace the MTBE crap.
I gotta get outa here. People wonder why they get better mileage when they fill up in AZ or NV...
I gotta get outa here. People wonder why they get better mileage when they fill up in AZ or NV...
03-02-2011, 05:52 PM
#56
I haven't seen 93 anywhere in Cali. 91 is what most stations have for premium. I went to Costco to fuel up but saw the "10% ethanol" sign and left... well, the joke was on me because I did a little research and found out that "carb" (ca air resource board - a complete fuggin scam) requires ALL CA gas to contain 10% ethanol. Seems they used that to replace the MTBE crap.
I gotta get outa here. People wonder why they get better mileage when they fill up in AZ or NV...
I gotta get outa here. People wonder why they get better mileage when they fill up in AZ or NV...
03-02-2011, 08:55 PM
#57
Registered User
I doubt 10% ethanol adversely affects engine performance much. It is my understanding MTBE was found to be a major water pollutant, the reason why it was replaced by ethanol.
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