Just FYI "Research Octane Number" and the octane number they (Toyota) used with their testing/research is different. I know, its confusing, I use to think the same thing. Research Octane Number, or RON, is actually a certain octane classification standard. The RON rating system is used in other countries (which is why Toyota list the RON in the manual). In the US, our octane numbers are obtained by averaging the RON and MON (Motor Octane Number, yet another fuel octane specification).jofrad said:if you read your manual it does say its ok to use regular but they researched it with the use of 91 octane. i use premium on mine only
Different compression ratios for the ES350 so it needs 91 but you can use 87 it won't knock.Joe B said:Same engine in the Lexus ES 350 which calls for 91 and squeezes another 4 HP with 91.
No way Toyota execs would want to have a Camry need premium.
It's a economy car and that would turn off potential buyers.
So it's 87 which does the job.
I like to have the best performance so I go with 91 or 93.
http://www.answers.com/topic/toyota-gr-engineakira751 said:Different compression ratios for the ES350 so it needs 91 but you can use 87 it won't knock.
I mainly use Shell 93.smilepak said:Since gotten the car, I only use Premium (91) in the car. The gas brand will goes as followed
1) Chevron, in case no Chevron and I REALLY need gas
2) Shell, in case no Chevron or Shell and I REALLY need gas
3) Mobile, in case no Chevron or Shell or Mobile and I REALLY need gas
4) Philip 76....
5) Last resort BP or Arco gas...
Unless i am totally out of gas and non of the above exist, I will put enough of other brand to get me to the next nearest gas station where one of the top 3 option exist.
I guess due to the California strict air emission, the best we got is 91. We used to have 93 and if memory serve me right, there was a point we had 101 or something like that..sadly 91 now...Joe B said: