gas

[dsgarvey]

The Tundra is supposed to run on 87 octane right, I don't need to be putting 93 in it do I?

[RONE]

87 is correct. Unless you have a supercharger installed.

[pacos_taco86]

i thought the higher the better?? so 89 or 91/93 is not good to run stock or wit slight mods for the 5.7L?

[virg]

Originally Posted by pacos_taco86

i thought the higher the better?? so 89 or 91/93 is not good to run stock or wit slight mods for the 5.7L?

Run the recommended gasoline octane your owner's manual recommends. 91/93 octane gas is no better than the recommended 87 octane. In fact due to more "knock" elimination additives, it is a less volatile gasoline (does not have as much energy) than 87 octane. Some high performance engines require high octane gasoline's because of higher compression ratios to achieve their horsepower ratings. A popular urban myth states that higher octane gasoline's contain better additives to reduce carbon buildup and injector failure. Not true; federal law requires all gasoline's to provide enough additives to provide good engine performance and cleanliness.

Don't pay for what you don't need...

virg

[Impelled]

Save yer money....87

[camry25]

When we run regular in our Camry the exhaust becomes very black and sooty. Whith premium this is cleaned up after about 3 tanks. I enquired at the high end shop that works only on Toyota/Honda, talking to the owner, a very knowledgeable guy, said to get the total performance out of the Tundra run premium fuel. Also he said the increase in mileage will basically offset the cost difference. Doing 67 mph I get 24 mpg. Driving to work hwy/city 21 mpg. Better than my v6 Ford was. Owners manual says minimum standard is regular.

[usnretired]

87, I repeat, eighty-seven is all that you need. The owners manual is correct.

[SHO_Maniac]

Octane by definition is the resistance of the fuel to detonation. All new engines do have anti-knock sensors so if they detect detonation they will retard the timing, you need this because not all fuels are exactly going to be the octane shown on the pump sticker. Pro-longed detontation can do engine damage as it really stresses all the internal parts.

Detontation usually occurs when you run lower octane fuel in a higher compression engine and especially when you put a load on the engine. To protect itself the knock sensors will retard the timing and you will suffer reduced performance.

You can run higher octane fuel in your Tundra if you want but its highly unlikely you will see any performance improvement.

I used to own a Civic with a higher compression engine and it said to use premium fuel on the fuel door. I tried regular and premium many times over the 10 years I owned the car and I couldn't tell the difference in performance or fuel economy, However, my wife drives a 2009 Acura TSX. The engine in this car has compression of 11:1 and it also says on the fuel door to use Premium fuel. Having the same belief from owning the Civic we were using regular gas for the first few months. On a trip around the city I noticed that the car pinged a ittle bit on a harder accerlation. So I told her next time fill it with premium and let me know when she had so I can drive it. In this car I could feel that performance was better and the knock was gone. In addition we logged the milegage over a few tanks and fuel economy was way up too. Costs us more per tank now but we do see some benefit.