Does the TSX *really* need 91 Octane?
#81
The higher compression and lower oct fuel cause a accelerated build up of carbon deposit on the cylinders and valves. The result is lower fuel economy and power form the ECU, but also slightly more chances of wear and tear by the carbon falling off and scoring the cylinders.
#82
Just bought an 07 TSX with 24k miles on it. Been researching this issue over the past few days. Been reading posts from people who say 87 is ok, and those who don't.
I did run across these, which basically make my mind up. I am going to go with 87. It is a .40 a gallon difference here (I can only find 93). This equals about $400 a year or so for me.
http://www.aboutacura.com/2007/12/ca...-my-acura.html
http://usatoday30.usatoday.com/money...emiumgas_x.htm
I did run across these, which basically make my mind up. I am going to go with 87. It is a .40 a gallon difference here (I can only find 93). This equals about $400 a year or so for me.
http://www.aboutacura.com/2007/12/ca...-my-acura.html
http://usatoday30.usatoday.com/money...emiumgas_x.htm
#84
Banned
When I'm in the city, I can find cheap (8 cents above regular) premium gas, so I use it. 8 x 15 = $1.20, which is chump change no matter how poor you are. When I'm on a road trip, the price of premium can be astronomical, but the price of 89 octane is usually pretty close to regular, so I use it. My gas mileage has been fine with 89 octane.
My question for everyone is, when do you think you are putting the most load on the engine? Stop-and-go driving, or highway driving? When do you put your foot to the floor, and want that extra horsepower that 91 octane gives you? I say it's when you're driving around town. When I pass cars on the highway, I usually don't bother downshifting from 6th gear. You need 91 octane in the city in order to get the most out of this engine.
My question for everyone is, when do you think you are putting the most load on the engine? Stop-and-go driving, or highway driving? When do you put your foot to the floor, and want that extra horsepower that 91 octane gives you? I say it's when you're driving around town. When I pass cars on the highway, I usually don't bother downshifting from 6th gear. You need 91 octane in the city in order to get the most out of this engine.
#85
My question for everyone is, when do you think you are putting the most load on the engine?
Since air densities are only high near full throttle and at lower elevations, most of the time lower octanes are sufficient. Burning premium just to cruise on the interstate is a waste. That said, if you are at lower elevations and punch the throttle frequently, then higher octanes are appropriate.
I tend to give 80% throttle and shift early (3100 RPM) while accelerating to maintain a high engine load. This is an efficient way to accelerate. Since the load is high and I live near sea level, I stand to benefit from higher octanes.
#88
Senior Moderator
Sure
#90
I know that this is an ancient thread.
93 (or 91 for some) does return better MPG. Even on the highway. This is a modern car that will take advantage of as much timing advance as possible.
However....around here, 93 is ~30% more expensive than 87. I'm not going to get 30% better MPG. So....I use 89.
I use 89 octane for ONE reason. 87 causes quite a bi of pinging at many load/RPM scenarios.
89 causes some small amount of audible pinging too. But I have to lug the engine pretty hard to cause it. In winter, its a bit worse. Seems like the coldness does not make up for the denseness.
My "commute" is like 5 miles per day now. In summer, its even less because I ride my bike more. So its not that I can't afford 93. 93 just doesn't make any logical sense.
93 (or 91 for some) does return better MPG. Even on the highway. This is a modern car that will take advantage of as much timing advance as possible.
However....around here, 93 is ~30% more expensive than 87. I'm not going to get 30% better MPG. So....I use 89.
I use 89 octane for ONE reason. 87 causes quite a bi of pinging at many load/RPM scenarios.
89 causes some small amount of audible pinging too. But I have to lug the engine pretty hard to cause it. In winter, its a bit worse. Seems like the coldness does not make up for the denseness.
My "commute" is like 5 miles per day now. In summer, its even less because I ride my bike more. So its not that I can't afford 93. 93 just doesn't make any logical sense.
#91
Azine Jabroni
Thanks for clarifying
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