I have tried regular and mid grade numerous times and see no difference in mileage or performance.

 

The only time the engine performance would suffer from not having the recommended (higher) octane gasoline is when/if you put the engine under more than a moderate load (e.g. pedal-to-the-metal acceleration, drop-down passing gear, climbing lengthy steep grade hills, etc.). Even then, the engine's knock sensors are designed to retard the engine's timing so no damage is done. However, you would likely feel a pulsating engine response with hesitation when putting the engine under considerable load as the ECU adjusted for the less than recommended octane rating gasoline.

 

Here in Vancouver shell 91 has zero ethanol and chevron 94 has zero ethanol. Everything else has at least 10 percent ethanol

 

Dear Nick:

You're a Lexus Test Driver, so this is very helpful information. A few followups: are you suggesting that it doesn't matter what octane gas we use in our Lexuses, or just that E10 is no better or worse for the engine than "real gas" is?

I have always wondered if 87 octane E10 was harmful, compared to the "recommended" 91 octane E10.

What type of gas would you use in your own 2010 MX 350?

 

Who are you addressing your question to?

What is a MX 350?

Do you realize that the last post in this thread (before you made your post) was 39 months ago?

 

Go easy dude, he/she is new to the forums. Also he probably meant NX350 since the letter M is next to N. lol

 

 

This is probably the most heated debate on these forums. Do whatever makes you comfortable. I have use 87 octane in our 2015 RX450h and currently 2017 which both premium is required. Experimenting with the other two levels, I have noticed zero difference in gas mileage or performance. I have used 87 in cars that have required premium for over a million miles and have not had one problem.
I always revert back to two MIT graduates that are car mechanics who had a syndicated radio show called Car Talk for 35 years.
http://www.cartalk.com/content/premi...egular-0#myth4

From the USA Today:
The only modern engines that should really need premium are those with superchargers, which force-feed fuel into the cylinders. "You're driving along and just tramp the gas and the knock sensor cannot sense the knock fast enough in some cases," because the supercharger boosts pressure so fast, says Bob Furey, chemist and fuels specialist at General Motors.

Burning regular when the owner's manual specifies premium won't void the warranty, nor damage the engine, even the most finicky automakers say. "You're giving up perhaps just a little bit of performance that a customer wouldn't really even notice, it's so slight," says Furey.

 

I'm still waiting for someone to tell me what a 2010 MX 350 is...

 

Cheapest top tier, otherwise Shell

 

there both great shell is terrific and so is chevron

any issues with shell are gas station location issues with bad fuel

and for all with the the 87
i have a loaner that i filled with 87 because was on highway and it runs crappy on 87 and good on premium
i haven't seen what the difference is in mpg but its usually 5% for that
i would run premium the way this thing is running with regular is a huge difference not in a good way

 

Bro its Mommy X-over lol. most likely RX since NX wasn't out in 2010 and thats the only 2010 I see in anyones post

 

Hi Jim,

Welcome to the ClubLexus (CL). Nick (NickTee) is not a real Lexus test driver, lol.

"Lexus Test Driver" is one of the many forum titles that is automatically assigned to users based on how many posts they have made. Others include:

• Rookie
• Lead Lap
• Pole Position
• Lexus Champion
• etc

Hope that helps,

~ Im2bz2p345