Just wondering, i have 2010 corolla le and not really sure which octane rating i should use bc im getting confused on rating/grade.. should i be using 87,89 or 91?
As written in the user manual, the corolla's motor is rated to use 87 grade. Unless you have done engine modification that would bring an increased pressure in the combustion chamber, you should not change octane grade. Putting a higher octane gasoline than required in your car is just a waste of money. Higher octane gasoline have higher ignition temperature and is used to avoid engine knocking (when high pressure are present like the use of forced induction or high compression ratio).
As written in the user manual, the corolla's motor is rated to use 87 grade. Unless you have done engine modification that would bring an increased pressure in the combustion chamber, you should not change octane grade. Putting a higher octane gasoline than required in your car is just a waste of money. Higher octane gasoline have higher ignition temperature and is used to avoid engine knocking (when high pressure are present like the use of forced induction or high compression ratio).
I hope this clarifies the use of octane levels.
To help make it crystal clear, if you're not boosted, using a higher octane than 87 is a waste of money.
__________________
2009 Corolla S : Kenwood Kdc-x993, Polk MMC6500, Polk db651, Rockford Fosgate T110D2, Alpine Pdx.5
Magnaflow 2.25" Muffler, TWM Short Shifter and Base Bushings, Summit Engineering Shifter Cable Bushings, Tein S-Techs, V-Leds LED's, Enkei RPF-1 (18x8 +35), Inno IN-SU Roof Rack.
As written in the user manual, the corolla's motor is rated to use 87 grade. Unless you have done engine modification that would bring an increased pressure in the combustion chamber, you should not change octane grade. Putting a higher octane gasoline than required in your car is just a waste of money. Higher octane gasoline have higher ignition temperature and is used to avoid engine knocking (when high pressure are present like the use of forced induction or high compression ratio).
I have Rochelle the wife put 87 in the Corolla but out here in Colorado our octane ratings are 85, 87, and 91. My wife works as an EMT here in town but her work is around 2 months behind on payroll due to some issued going on. Well, her one boss filled up her car the other day with the company gas card but used 85. The car has been running okay but I have noticed the fuel economy went to crap. Around town we were averaging around 29mpg and now we are just under 26 mpg.
__________________
Current:
2007 Tacoma 4X4 Extended Cab TRD Off Road Package. Speedway Blue
2010 Corolla S. Black Sand Pearl.
Still looking for my 97' Tacoma. VIN # 4TAWM72N1VZ302525
I have Rochelle the wife put 87 in the Corolla but out here in Colorado our octane ratings are 85, 87, and 91. My wife works as an EMT here in town but her work is around 2 months behind on payroll due to some issued going on. Well, her one boss filled up her car the other day with the company gas card but used 85. The car has been running okay but I have noticed the fuel economy went to crap. Around town we were averaging around 29mpg and now we are just under 26 mpg.
You might wanna be really careful, the 1.8 L engine has a enough of a high compression ratio of 10:1. It means it takes 10 parts volume of air and compresses it at one part at high pressure just before ignition. High compression could bring up pre-ignition and cause engine knocking. In some cases when the pressure goes high enough the air fuel mixture ignites before the piston actually reaches top of the cylinder. Then this mixture, now burning continues get compressed and creates higher than expected(design specs) pressures. It can lead to engine failure.
Keep in mind that when a gas is compressed it gains energy. It will then rise in pressure and temperature. The rising temperature is what causes the problem of pre-ignition (knocking).
Octane rating is somewhat the property of gasoline to resist pre-ignition. It increases the threshold temperature before combustion starts. So lower octane will lower the ignition temperature and can lead to engine knocking.
With the VVT-I engine of the corolla, the ECU can compensate the valve timing to avoid the knocking. I'm not saying it's ok to run lower octane rating than recommended...
Anyway, to cut it short: use what manufacturer recommends.
In your case, if you notice some knocking in your corolla with the 85 rated gasoline I would suggest go buy an octane bottle and pour some in your tank.
I have Rochelle the wife put 87 in the Corolla but out here in Colorado our octane ratings are 85, 87, and 91. My wife works as an EMT here in town but her work is around 2 months behind on payroll due to some issued going on. Well, her one boss filled up her car the other day with the company gas card but used 85. The car has been running okay but I have noticed the fuel economy went to crap. Around town we were averaging around 29mpg and now we are just under 26 mpg.
There is nothing to worry about using 85 octane at higher elevation is similar to using 87 al lower elevations. As elevation increases the octane requirements decrease due to the less dense air. When I lived in Colorado & New Mexico I never had issues using 85 octane on my non-boosted cars.
When I took my trip to New Mexico this summer I didn't notice any difference in performance or MPG with the many tanks of 85 octane gas that I used in Utah, Arizona & New Mexico. I would just say to use a high quality gas like Shell or Chevron.
__________________ 89 Supercharged White MR2 5-speed / 09 Corolla S CSM 5-speed
07 Matrix XR Gray Pearl 5-speed (sold 11/23/11)/ 94 Corolla DX Red 5-speed / 95 Previa S/C White Auto/
07 Corolla CE CSM 5-speed/ 10 Prius III Blizzard Pearl
The car hasn't knocked at all. The only thing I noticed was slightly worse fuel economy. But also don't know all what kind of driving the wife has been doing either. She may have encountered more traffic lights or due to colder weather this last week, she even may have started the car early and let it run a few minutes before leaving for work.
But yeah, I told her to make sure her car is only run with at least 87 octane from now on.
__________________
Current:
2007 Tacoma 4X4 Extended Cab TRD Off Road Package. Speedway Blue
2010 Corolla S. Black Sand Pearl.
Still looking for my 97' Tacoma. VIN # 4TAWM72N1VZ302525
The car hasn't knocked at all. The only thing I noticed was slightly worse fuel economy. But also don't know all what kind of driving the wife has been doing either. She may have encountered more traffic lights or due to colder weather this last week, she even may have started the car early and let it run a few minutes before leaving for work.
But yeah, I told her to make sure her car is only run with at least 87 octane from now on.
The colder weather will affect your mpg in a negative way but the 85 octane will not. If you travel to a lower elevation you will see the octane numbers increase. If using a higher octane you will have more issues with carbon deposits. Putting in mid-grade with only be wasting money.
__________________ 89 Supercharged White MR2 5-speed / 09 Corolla S CSM 5-speed
07 Matrix XR Gray Pearl 5-speed (sold 11/23/11)/ 94 Corolla DX Red 5-speed / 95 Previa S/C White Auto/
07 Corolla CE CSM 5-speed/ 10 Prius III Blizzard Pearl
First time posting so Hi TN..
I just got a 2010 Corolla S, I have a company card and always run 91, is this bad? I've heard from many that it is actually good for fuel injectors etc?
In my parents MBZ I obviously must put in 91, but in the corolla i didnt think it was necesarry, but is there any actual good consequences for using high octane?
First time posting so Hi TN..
I just got a 2010 Corolla S, I have a company card and always run 91, is this bad? I've heard from many that it is actually good for fuel injectors etc?
In my parents MBZ I obviously must put in 91, but in the corolla i didnt think it was necesarry, but is there any actual good consequences for using high octane?
First of all, to TN.
As far as 91 octane I would never use it in my Corolla unless It had forced induction. Higher octane gas will have less energy in it & will leave higher carbon deposits. I use higher octane gas in my Supercharged MR2 as it helps with detonation but you will not have those issues using regular unleaded in the Corolla. Just use a high quality gas like Shell or Chevron, save your money & you will be fine.
__________________ 89 Supercharged White MR2 5-speed / 09 Corolla S CSM 5-speed
07 Matrix XR Gray Pearl 5-speed (sold 11/23/11)/ 94 Corolla DX Red 5-speed / 95 Previa S/C White Auto/
07 Corolla CE CSM 5-speed/ 10 Prius III Blizzard Pearl
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The Following User Says Thank You to SuperchargedMR2 For This Useful Post:
First time posting so Hi TN..
I just got a 2010 Corolla S, I have a company card and always run 91, is this bad? I've heard from many that it is actually good for fuel injectors etc?
In my parents MBZ I obviously must put in 91, but in the corolla i didnt think it was necesarry, but is there any actual good consequences for using high octane?
A summary of this thread would basically say that it's a waste of money. So, no. No good consequences, and possibly some bad ones (potential carbon build up).
__________________
2009 Corolla S : Kenwood Kdc-x993, Polk MMC6500, Polk db651, Rockford Fosgate T110D2, Alpine Pdx.5
Magnaflow 2.25" Muffler, TWM Short Shifter and Base Bushings, Summit Engineering Shifter Cable Bushings, Tein S-Techs, V-Leds LED's, Enkei RPF-1 (18x8 +35), Inno IN-SU Roof Rack.
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