Better gas mileage with different octane?

I use 85. If you’re in Utah, you should also have 85 octane available. Regular. That’s all is needed.

 

What does your owner's manual recommend?

 

I run ethanol free. 89 octane get 20 miles per gallon.

4 banger M/T

 

I run regular (85) in my Tacoma, Sienna, old Tundra, Landcruiser, 4Runner. I’ve asked service writers at Toyota. All say 85 is fine. Listen for pinging. Never heard a peep. Low elevation folks need not apply.

 

What does your owner's manual recommend?

 

Fair warning. Get out of here fast before you begin to hate your truck.
I run 91/93 all the time. I don’t notice any better gas mileage. I do notice better performance and the ability to hold higher gears easier.

 

Using 87 tank average 20-25mpg v6 Auto in ect mode. Combination City and hwy with famous socal traffic. This was the last trip summary, and tank average the next day

 

What was the total mileage travelled for that tank? The 40 miles MPG average doesn’t mean much, but tank avg could have some significance.

 

90 ethanol free better gas mileage and more power

 

I Try to fill up before I get to 1/4 so that 20.7 tank average was half the tank about 200 miles give or take

 

You would have to be getting a pretty significant gain in mpg or be getting a screaming deal on premium gas for this to matter at all.

If you pay $10 more a tank and get 20-40 more miles out of it, is it worth it? That's if you saw a gain in mpgs at all.

Seriously, right now premium gas costs 16% more than regular. You have to get at least 16% better mileage to make this make sense.

So if you were getting 20mpg with reg you'd need to hit 23.2 to break even with premium.

(Hopefully that's making sense. I'm half asleep)

 

Math. It's a beautiful thing.

 

His manual recommends 87 octane. If he's at altitude where 85 octane is sold he is right to use 85 octane as his engine is not able to make use of 87 at high altitude. Air is much thinner and it creates a compression loss. Therefore 85 is all he needs. It's the same reason non turbo engines can lose up to 20% of their horsepower up high.

 

You might want to update your research. We don't run carbs anymore. 87 is what is needed in modern engines at altitude. You are gonna lose horsepower at altitude no matter what you do.

 

Wrong, higher resistance to detonation from a higher than recommended fuel on an engine designed to run on 87octane will cause you to lose power. The ecu will adjust timing to compensate for the lack of combustion happening up to a point. Let me know how it goes when you are replacing your cat and oxygen sensors before 100k miles

 

How the heck do you keep your dash so clean?

 

I keep a micro fiber cloth in the center console

 

Why did the 2nd gens make more power with premium?

https://www.tacomaworld.com/threads/high-or-low-octane.659/

 

You say that you lose hp at altitude. The reason for that is because of thinner air, less compression and therefore less knock resistance is needed. At 7000ft above sea level an NA engine doesn't care if you put 85 or 93 in it as far as knock.

 

Your right modern engines don’t have mass air flow sensors and absolute manifold pressure sensors to measure air volume and density