What octane gas do you use for your Tundra?

I ran 89 for the first time since I purchased my truck last year and was pretty surprised with how mellow the engine had become. I posted months ago about feeling a very slight vibration in my gas pedal at random, fast, intervals. My wife even commented on it, uh-oh...anyways @ColoradoTJ diagnosed my
problem as a likely needle bearing (known issue), I did my research and agreed, it wasn’t problem I was going to throw a dime at, but good to be aware...fast forward to me using 89 for the first time last week, my gas pedal is smooth as butter now, no more slight “grindy” feel thru the pedal at all...I don’t know what to think...

 

Its "all" in the additive package. A single fuel terminal may supply gasoline to all kinds of brands - Costco, Mobil, Shell, Kroger, Billy Bob's road stop. The bigger brands will supply their own additives -V power, Techron, Synergy, etc. (often the terminal will have tanks of the stuff on site, including "competitor" product to mix in) while the other brands might source something like Additech. 87 and 91/93 get the same amount of the stuff, and 89 is just a mix of the two

 

So all octanes of shell have this v-power that they only seem to advertise as in their top tier 89 here?

 

This is all correct most but all has the same additives..

 

I don't know about that weird 85 stuff you guys have up there but otherwise yes

 

I use nothing but 91..... I can feel better performance and it has less ethanol which is the death of an engine

 

Again, I'm curious about flex fuel trucks/cars. Does running ethanol free gas make these engines run better when they are set up to run E85? Does "up to" 10% ethanol in 87 octane fuel adversely affect a flex fuel 5.7L Tundra when you can mix in E85 (manual says start switching from regular gas to E85 at a quarter tank and vice versa) with regular gas and run the truck just fine?

 

You lose 3-4 miles per gallon running E-85 rather than 87 and E-85 is horrible... ethanol has a ton of water and eats the hoses from the inside out ....

 

Then why do some race car enthusiasts convert their engines to E85 for more performance? That is, instead of paying the high price for racing fuels, they simply transform their hi-po car to run on E85.

 

It has more alcohol in it. It’s the bi- product of corn ... but it has a ton of moisture... just ask boat people how they like it... I’ll stick with 91.... I notice better performance and better fuel economy even though my truck is a gas hog

 

so to decrease engine noise would using a 89 octane ethanol free gas help or hinder? thats my question

 

87 Costco

 

Bourbon

 

Pure 100% ethanol has like 115 octane e85 is like high maybe 109 octane. 87,89,91, and 93 has the same level of ethanol 10%. Its just 93 is more resistance to knock. So when your towing maybe 6000lbs up a hill and the engine is lugging it wont take timing out as much as 87. On some gas station has that 93 has 10x the cleaning agents than 87 which is true theirs was somebody that tested that on youtube. If its 0.50 difference than ill go to 87 but if it goes close to 0.30 than 93 at Sunoco. If I live in a hilly area i would run atleast 89 but what do i know...

 

I run 91 ethanol free fuel. She runs good and a little more peppier. I read something from DAP tuning on how much the engine automatically retards the timing with each fuel octane. They recommend 91 or better just to keep the engine running top

 

Since I got the DAP Tune I've been running 91 but it's not ethanol free but it is not expensive either. I'm averaging around $2.50/gal for 91 with the ethanol, can't complain about that

 

Here’s the truth about octane and I’m surprised some obviously don’t understand octane. All engines with cylinder compression ratios at 9.5:1 and below are to run on 85-87 octane. Basically regular gas. Higher octane is only for engines with compression ratios above 9.5:1 like 91, 93 or even 95 in some places. Higher octane does nothing more than slow the burn rate of the fuel so that in higher compression engines (>9.5:1) the fuel will not ignite due to compression heat before the spark ignites. This prevents knock or what is called pre-ignition. Using a higher octane like 93 in a lower compression engine like our 4.6 and the larger 5.7 will actually rob your engine of power. USE THE OCTANE LEVEL RECOMMENDED BY THE VEHICLE MANUFACTURER. They know what compression ratio they designed the engine for and the octane they recommend will provide the best performance from that engine

 

Also, unless you do a mod that actually increases the cylinder compression ratio, stick to regular 85-87 octane. Anything higher will burn too slowly and be an incomplete burn, robbing your engine of power

 

Costco 87 , and when i have extra money , i switch it to 91 once in a while, cant tell any difference except my money.

 

Both the 4.6 and 5.7 UR engines are 10.2 : 1 compression ratio, so exactly what are you saying? 87 octane or 93?

 

My 2017 (naturally aspirated) needed 91 or would start to make noises at transition between low rpm and any raised stress or increase in load. I have only filled up once in my 2020 and out of habit filled with 91.

 

You cant be more wrong lol. Our engines are like 10:2. And Toyota reccommends 87 because it runs on 87 without any issues dosent mean its the best. When you see the 5.7 on the dyno running 87 octane all the timing is being pulled like 14 degrees!! But it still runs fine with it. Running 93 octane only pulls 2 degrees. Running 93 octane=advanced timing and pulls fuel and that equals to better mpg. Running a tune is even more beneficial. Keep it simple the only difference is 93 is more resistant to knock which therefore can advance timing and make more power. Toyota would not reccommend 93 because who would buy a truck that can only run 93 octane and that has the worst mpg out their and alot to do with epa regulations also...

 

So I've been running zero ethanol 93 octane in my truck, with a DAP tune, and it's running great. It was running strong on the 91, with ethanol, but it's running really good on the 93 no ethanol. According to my Fuelly app my last MPG was 17.7, my best MPG was 18.7 and my average MPG over the life of my truck (since I've owned it and ran everything from E85 to regular 87 all the way up to some 98 octane--NASCAR fuel--) is 15.2.

 

The Tundra’s Dual Independent Variable Valve Timing with Intelligence system is used to maximize fuel efficiency and power delivery. Regular 87 is best. Higher octane just slows the burn

 

That is false and dap tune and ov tune can back me up on this. The 5.7 engine is max out as timing goes if running 87. Running 93 will perform better all around and its been proven on the dyno on stock engine. Like i said try 93 right now its really cheap if you dont like it switch back to 87. And yes 93 is slower but not for a incomplete burn and we are talking 10:2 compression guys not 9:5 that's the most idiotic thing I heard all year...

 

Also owner manual says minimum of 87 octane. But dosent say best octane. Its safe to run 87 or 93. But i notice if i run 87 it will ping alittle under heavy load. If you put in 93 octane let the ECU adapt to the new octane, so couple tanks full should be enough to fully adapt.

 

The best part of the zero ethanol 93 octane is the low end torque. This truck just jumps off the starting line. On the higher end, that is, when the RPMs get up, I can't really tell much of a difference in the performance on this truck, and really, these are not high revving engines to begin with. But the low end of the RPM curve, yep, it's real nice...

 

I keep it simple and run 87 and try to stick to “top tier”