Which type of gas?
08-08-2011, 04:24 AM
#15
08-08-2011, 02:13 PM
#19
Senior Member
Join Date: Nov 2010
Location: Powder Springs, GA
Posts: 400
Bought vehicle 5 years ago at 135K miles; now has about 215K. Never use anything but regular; no knocking or pinging, smooth, and still runs like a scalded dog. Manufacturer recommeds premium for marketing reasons more so than performace or mileage, but ECU adapts to the lower octane level with no problem.
08-08-2011, 02:38 PM
#20
Member
Join Date: Mar 2011
Location: Worcester, MA
Posts: 135
Bought vehicle 5 years ago at 135K miles; now has about 215K. Never use anything but regular; no knocking or pinging, smooth, and still runs like a scalded dog. Manufacturer recommeds premium for marketing reasons more so than performace or mileage, but ECU adapts to the lower octane level with no problem.
And yes octane affects performance and mileage. The knock sensor is what keeps the engine from not pinging, it tells the ECU to retard the timing.
The VQ30DE has a compression ratio of 10 to 1. 91 octane is recommended for it to run normally.
But u run what u want to. Ur car not mine.
08-08-2011, 03:11 PM
#21
I would love to hear the marketing reasons.
And yes octane affects performance and mileage. The knock sensor is what keeps the engine from not pinging, it tells the ECU to retard the timing.
The VQ30DE has a compression ratio of 10 to 1. 91 octane is recommended for it to run normally.
But u run what u want to. Ur car not mine.
And yes octane affects performance and mileage. The knock sensor is what keeps the engine from not pinging, it tells the ECU to retard the timing.
The VQ30DE has a compression ratio of 10 to 1. 91 octane is recommended for it to run normally.
But u run what u want to. Ur car not mine.
08-08-2011, 03:34 PM
#22
Member
Join Date: Mar 2011
Location: Worcester, MA
Posts: 135
It is not good for the engine to keep running 87 octane because the ECU won't catch the knock all the time. So your engine does knock using 87 octane it's just not as noticeable with a knock sensor trying to compensate.
08-08-2011, 08:48 PM
#28
Senior Member
Join Date: Dec 2009
Posts: 469
Never said it wasn't. Keep running 91. Running anything lower will cause a knock. The knock sensor will pick it up and tell the ECU to retard the ignition timing.
It is not good for the engine to keep running 87 octane because the ECU won't catch the knock all the time. So your engine does knock using 87 octane it's just not as noticeable with a knock sensor trying to compensate.
It is not good for the engine to keep running 87 octane because the ECU won't catch the knock all the time. So your engine does knock using 87 octane it's just not as noticeable with a knock sensor trying to compensate.
I can't comment on MPG claims as I've never run a controlled experiment, but my MPGs dropped a few when I had a bunk knock sensor, the same condition the car is in when you pump 87. I kept very close track of my mileage. It rarely deviated from about 25.0MPG on premium, and it dropped to about 21.5 with the blown KS. Someone else will have to comment on how 87 vs 91 is affected by the sensor, as I've never consistently run 87 with a functional one, but my experience (retarded timing resulting in higher fuel consumption) seems to indicate that you should see an MPG improvement with premium. Someone else will also have to run the numbers on whether or not that evens out the extra $ for a tank of 91.
08-08-2011, 09:02 PM
#29
I am with everyone who have said to use Premium gas. The difference in price really isn't all that much from going Unlead to Premium so if you are looking for max performance and max mpg, Premium is the way to go.
08-08-2011, 09:15 PM
#30
Bought vehicle 5 years ago at 135K miles; now has about 215K. Never use anything but regular; no knocking or pinging, smooth, and still runs like a scalded dog. Manufacturer recommeds premium for marketing reasons more so than performace or mileage, but ECU adapts to the lower octane level with no problem.
08-09-2011, 11:03 AM
#31
Senior Member
Join Date: Oct 2009
Posts: 1,432
seems i get better gas milege with 87 octane but the motor feels really weak. when i run premium it feels like a whole different motor. yes my knock sensor works its new.
i get 26mpg highway and 20 city on 87 octane, and 28mpg highway on 93 oct and 16 to 17mpg city.
but it maybe cause i step on it more with premium, thats just my though i mostly run 87 but weekend fun i run 93. mine has 230k miles.
i get 26mpg highway and 20 city on 87 octane, and 28mpg highway on 93 oct and 16 to 17mpg city.
but it maybe cause i step on it more with premium, thats just my though i mostly run 87 but weekend fun i run 93. mine has 230k miles.
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