What gas does the 8 take?
One Shot One Kill
Joined: Jan 2008
Posts: 1,369
Likes: 2
From: Houston
hey man! where in austin to do you live? i'm w/nw.
anyway, i ran 87 for the first 4 years of ownership. just got a new motor (under warranty!!) and i'm thinking about premixing, altho i need to read up on it. what's the reasoning behind the correlation between higher octane and premixing?
anyway, i ran 87 for the first 4 years of ownership. just got a new motor (under warranty!!) and i'm thinking about premixing, altho i need to read up on it. what's the reasoning behind the correlation between higher octane and premixing?
Registered User
Joined: Nov 2003
Posts: 3,281
Likes: 1
From: Glendale, CA
I use 91. You can use 87, but it's at the bottomend of what the ECU can compensate for. There have been a few threads on this subject where the posters tried to run below 87 octane & got detonation. 87 seems to be about the bottom of where the engine can no longer retard the timing.
Grand Chancellor
Joined: Jul 2003
Posts: 2,733
Likes: 62
From: Home of the NIMBYs
How so? We all know (ok some still are clueless) that the government requires that all fuel irregardless of grades to contain fuel additives/detergents. The only difference is the slower ignition nature of higher octane fuel.
My <3 rotates.
Joined: Sep 2006
Posts: 722
Likes: 0
From: Norfolk, VA
All I know is my mom once put 87 in my car.. The check engine light came on until I filled her back up with 93... My sister put 87 in her, the check engine light came on until I filled up with 93....
I only run 93 in mine along with pettit racings premix. I do it for my 7 and my 8.
I only run 93 in mine along with pettit racings premix. I do it for my 7 and my 8.
the higher the octane the more compression the fuel needs to burn completely. thus why you put premium in high compression motors... to prevent detonation... if the octane is too low and the compression is too high, you pre detonate the mixute which can cause serious engine damage. I use premium (91 or 93 depending on the staion) but ive heard of people being ok with middle grade.
All grades should burn clean and complete, its more a matter of what octane you should use to prevent the dreaded "marbles in a can"
All grades should burn clean and complete, its more a matter of what octane you should use to prevent the dreaded "marbles in a can"
I will say, the car is worth it, but its not worth it to give my hard earned cash to greedy traders & prince to buy A380 as a private jet.
I've been using 89 (mid grade) for couple of weeks already. Not to mention I got myself a Honda FIT and it uses Regular, can go 250-290 miles b4 I fill it up, each fill up cost me maybe 30 something bux.
I've been using 89 (mid grade) for couple of weeks already. Not to mention I got myself a Honda FIT and it uses Regular, can go 250-290 miles b4 I fill it up, each fill up cost me maybe 30 something bux.
Lubricious
Joined: Oct 2003
Posts: 3,425
Likes: 4
From: SF Bay Area, California
One Shot One Kill
Joined: Jan 2008
Posts: 1,369
Likes: 2
From: Houston
well, though i said i run premium, i just recently started running 89 on my long distance cruise (like 200 mile highway trip between dallas/houston) and the engine feel just as smooth, i guess if you drive light and long trip, running 89 may be a smart thing to do.
n00b post whore
Joined: Mar 2008
Posts: 535
Likes: 0
From: San Jose, CA
Good luck with that, I hear the Corolla is a good car.
Registered Lunatic
iTrader: (1)
Joined: Aug 2003
Posts: 3,591
Likes: 49
From: SF Bay Area, California
n00b post whore
Joined: Mar 2008
Posts: 535
Likes: 0
From: San Jose, CA
It's a Cavalier
Joined: May 2007
Posts: 1,926
Likes: 5
From: Austin, TX
Again, nobody does the f'ing arithmetic!!!! DAMN.
Averaging 12,000 miles a year, and getting an average of 16 mpg, you burn 750 gallons of gasoline per year.
Premium is about 25 cents a gallon more than regular. Per year, you spend $187.50 more, which works out to $15.63 a month to run premium.
Some of you people will spend thousands on mods or hundreds on wax and won't spring 15 damn dollars a month to run premium. Holy ****.
In any case, running premium will never break the bank... increase in gas prices may, but unleaded regular vs. premium is fixed cost around 25 and 30 cents a gallon.
Registered
Joined: Jan 2007
Posts: 39
Likes: 0
Direct Quote from my user manual!! Yes, you can use 87!!
You can download the manual here. http://www.mazdausa.com/MusaWeb/pdf/...2005RX-8OM.pdf
Your Mazda will perform best with fuel listed in the table.
Fuel Octane Rating*(Anti-knock index)
Premium unleaded fuel 91 [ (R+M)/2 method] or above (96 RON or above)
* U.S. federal law requires that octane ratings be posted on gasoline station pumps.
You may use a regular unleaded fuel with an Octane Rating from 87 to 90 (91 to 95 RON) but this will slightly reduce performance.
Fuel with a rating lower than 87 octane (91 RON) could cause the emission control system
to lose effectiveness. It could also cause engine knocking and serious engine damage.
Fuel Octane Rating*(Anti-knock index)
Premium unleaded fuel 91 [ (R+M)/2 method] or above (96 RON or above)
* U.S. federal law requires that octane ratings be posted on gasoline station pumps.
You may use a regular unleaded fuel with an Octane Rating from 87 to 90 (91 to 95 RON) but this will slightly reduce performance.
Fuel with a rating lower than 87 octane (91 RON) could cause the emission control system
to lose effectiveness. It could also cause engine knocking and serious engine damage.
it isnt -that- much... I know it's a decent amount... but here's bit more of an extreme example of how much extra it might cost you...
lets say you drive 30,000 miles a year.
at 15 mpg, that's 2,000 gallons of gas.
if it costs $.30/gallon more for premium, then you pay $600 a year more for gas.
(that's $50 a month).
I'm guessing that's a more extreme number for both yearly mileage and average mpg.
lets drop it to 20,000 miles @ 18 mpg. That's $333.33 a year and ~$28 a month.
Yeah it's definitely enough to think about, but if it's really the car you want, maybe it's worth it?
(someone please correct me on my math if I made some stupid error... I occasionally make the most obvious mistakes, but I believe my math is right)
lets say you drive 30,000 miles a year.
at 15 mpg, that's 2,000 gallons of gas.
if it costs $.30/gallon more for premium, then you pay $600 a year more for gas.
(that's $50 a month).
I'm guessing that's a more extreme number for both yearly mileage and average mpg.
lets drop it to 20,000 miles @ 18 mpg. That's $333.33 a year and ~$28 a month.
Yeah it's definitely enough to think about, but if it's really the car you want, maybe it's worth it?
(someone please correct me on my math if I made some stupid error... I occasionally make the most obvious mistakes, but I believe my math is right)
It's a Cavalier
Joined: May 2007
Posts: 1,926
Likes: 5
From: Austin, TX
This entire thread is stupid. 3 pages of it.
Again, nobody does the f'ing arithmetic!!!! DAMN.
Averaging 12,000 miles a year, and getting an average of 16 mpg, you burn 750 gallons of gasoline per year.
Premium is about 25 cents a gallon more than regular. Per year, you spend $187.50 more, which works out to $15.63 a month to run premium.
Some of you people will spend thousands on mods or hundreds on wax and won't spring 15 damn dollars a month to run premium. Holy ****.
In any case, running premium will never break the bank... increase in gas prices may, but unleaded regular vs. premium is fixed cost around 25 and 30 cents a gallon.
Again, nobody does the f'ing arithmetic!!!! DAMN.
Averaging 12,000 miles a year, and getting an average of 16 mpg, you burn 750 gallons of gasoline per year.
Premium is about 25 cents a gallon more than regular. Per year, you spend $187.50 more, which works out to $15.63 a month to run premium.
Some of you people will spend thousands on mods or hundreds on wax and won't spring 15 damn dollars a month to run premium. Holy ****.
In any case, running premium will never break the bank... increase in gas prices may, but unleaded regular vs. premium is fixed cost around 25 and 30 cents a gallon.
it isnt -that- much... I know it's a decent amount... but here's bit more of an extreme example of how much extra it might cost you...
lets say you drive 30,000 miles a year.
at 15 mpg, that's 2,000 gallons of gas.
if it costs $.30/gallon more for premium, then you pay $600 a year more for gas.
(that's $50 a month).
I'm guessing that's a more extreme number for both yearly mileage and average mpg.
lets drop it to 20,000 miles @ 18 mpg. That's $333.33 a year and ~$28 a month.
Yeah it's definitely enough to think about, but if it's really the car you want, maybe it's worth it?
(someone please correct me on my math if I made some stupid error... I occasionally make the most obvious mistakes, but I believe my math is right)
lets say you drive 30,000 miles a year.
at 15 mpg, that's 2,000 gallons of gas.
if it costs $.30/gallon more for premium, then you pay $600 a year more for gas.
(that's $50 a month).
I'm guessing that's a more extreme number for both yearly mileage and average mpg.
lets drop it to 20,000 miles @ 18 mpg. That's $333.33 a year and ~$28 a month.
Yeah it's definitely enough to think about, but if it's really the car you want, maybe it's worth it?
(someone please correct me on my math if I made some stupid error... I occasionally make the most obvious mistakes, but I believe my math is right)
