Premium fuel ya or na
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RichinRidgewood
New member
No.
The engine was designed for “regular”
The engine was designed for “regular”
thennen
New member
I had a 2001 as well. Agreed, regular gas is fine - the truck was built for it. BUT, on one long vacation trip (about 6000 miles), I saw that there were places out west selling gasoline without ethanol added. I decided to experiment, since I was watching mpgs out of curiosity due to pulling a trailer. I filled with straight gasoline when I could, and mileage seemed to increase by around 2 mpg. It wasn't premium, just no ethanol. A bit more expensive, too, so there was no economic gain.
Oldmanb777
New member
Higher octane (effectively) burns slower, so you loose efficiency. think of it like this. since it burns slower, some of the available heat isn't totally taken advantage of or used, and escapes out the exhaust ports prior to burning. You need the extra compression and timing to take advantage of the premium fuel. So its money wasted out the tail pipe. Not totally scientifically correct, but close enough to get the point across. At higher density altitudes it gets worse.
Depending on where you were in the West, altitude could also attribute to better gas mileage. I lived at about 4600' in AZ and got about 2 MPG better on average than I do now that I am in lower elevations--same vehicle.
thennen
New member
That's interesting. I wouldn't expect that, considering that the normal octane out there is (was) 85.5. But honestly, I didn't pay attention to any mpg/altitude connection. Maybe I was seeing what you're describing instead.
96RedRunner
Senior Member
Nay for premium
Have never noticed a difference with premium fuel ethanol or non in 4Runner.
My Audi V8 yes makes a difference premium real gas all it ever gets.
Have never noticed a difference with premium fuel ethanol or non in 4Runner.
My Audi V8 yes makes a difference premium real gas all it ever gets.
Birddog1911
New member
I traveled from CO to TX in my FJ, and lost 4-5mpg. MAn, I was glad to get back to 7000'!
Syr4RinNC
New member
unclear if premium will help - as you can see from previous comments.
But one of the things that is generally recommended is using "Top Tier" gasoline brands. They detergents and other additives that some research has shown to help keep the engine clean and running well. - based on AAA, consumer reports, etc
Homepage
But one of the things that is generally recommended is using "Top Tier" gasoline brands. They detergents and other additives that some research has shown to help keep the engine clean and running well. - based on AAA, consumer reports, etc
Homepage
702tripgen
New member
MyFJ had the 4.0 and I went back and forth with premium and regular and never noticed a difference either way. My fourth gen has a V8 and I run regular. Just run regular unless your OCD won't let you put regular in there. Lol
LandCruiser
New member
I also used the 85 octane trash CO fuel in many of my trucks for years with no ill effect.
Eltigreblanco
New member
I use premium while towing
mnofpeace
Member
no real benefits...
however
being an old racer, i know that higher octane gas runs/burns better/hotter, and that gives any engine a tad more power. researching it in the 4runners (5th Gens), i know using regular gives us about 270hp...but using 93 octane gives us roughly 300hp.
so for me, i only uses high octane gas when im going to be towing something, like my motorcycle trailer.
but under any other normal use...all gas octane levels are mandated by regulations to have the same chemical and cleaning benefits.
and as has been said...our truck engines are built to use 87 octane gas...and that is high-priced enough as it is...
however
being an old racer, i know that higher octane gas runs/burns better/hotter, and that gives any engine a tad more power. researching it in the 4runners (5th Gens), i know using regular gives us about 270hp...but using 93 octane gives us roughly 300hp.
so for me, i only uses high octane gas when im going to be towing something, like my motorcycle trailer.
but under any other normal use...all gas octane levels are mandated by regulations to have the same chemical and cleaning benefits.
and as has been said...our truck engines are built to use 87 octane gas...and that is high-priced enough as it is...
