Premium fuel 91 octane gains 20 hp / 14 lb-ft torque (vs. 87 octane) on gas engine 2.4L i-Force -- dyno test

[outdoorCO]

How does anyone really know if quality of gas makes a long term difference? Think about all the old ass trucks you still see running in low income towns, were they putting high quality fuel in….doubtful.

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[AtomicSushi]

How does anyone really know if quality of gas makes a long term difference? Think about all the old ass trucks you still see running in low income towns, were they putting high quality fuel in….doubtful.

Have you ever seen an engine tear down at a shop? Crappy gas leaves deposits, especially in DI turbo charged motors. I'm neither a mechanic or a scientist but I believe the way fuel is delivered allows for large amounts of buildup on the valves.

There's a few factors that go into making a gas good, or cheap. Octane IMO is the least important as long as you follow manufacturer recommendations., The other two are, the actual additive package that goes into the gasoline. This is where "Top Tier" gasolines are the best. I believe it probably doesn't matter which brand and they probably all buy the same packages, but Top Tier indicates you are getting the best. This is very important.

The 3rd factor is ethanol%. Most of the stations across the country that I have visited carry 10% ethanol. The reasons for this, at this point are mostly economic and political. They have nothing to do with the environment. There are many modern engines that do very well with e85 and other high ethanol blends because it is a cheap way to make octane without using the actual "octane" hydrocarbon. Gasoline is primarily comprised of the 2 hydrocarbons, Octane and Heptane (Anyone who has better or more accurate descriptions of this, please feel free to point out my errors). It is much cheaper to simply add moonshine to the gasoline and say "Octane boost!" especially since your hard earned tax dollars actually pay for this stuff. Don't expect it to go away as they are making way too much money off of you to ever stop burning our corn supply, but I digress.

No it is my opinion (based on what I hope has been a fair amount of education) that ethanol in a DI turbo is a recipe for disaster, unless you don't need to go beyond 100K miles. Others will say different, and hopefully back up what they say with some facts, but for my money, it will be 91 octane, ethanol free gasoline from QT unless I'm out of state and it is unavailable. I plan to keep the truck for 7 to 10 years. YMMV

 

[LARIN]

Wrong the 4Runner has direct injection and port injection. Direction injection only motors have the issue of carbon build up that is why manufactures now run both type of injection to help cure this issue.

 

[LARIN]

Ford still uses DI only on there 2.3 engines and can have this problem. Their v6 turbos have both

 

[willcasp]

How does anyone really know if quality of gas makes a long term difference? Think about all the old ass trucks you still see running in low income towns, were they putting high quality fuel in….doubtful.

AAA says it does. https://www.ace.aaa.com/automotive/advocacy/top-tier-gasoline.html

 

[Brian Day]

What about using non-ethanol gas . It is 90 octane , just no ethanol . Up here it's 10 cents cheaper per gallon . I run it in my boat with a 454 big block plus lawn mower and small gas motors .

 

[BadTrainDriver]

What about using non-ethanol gas . It is 90 octane , just no ethanol . Up here it's 10 cents cheaper per gallon . I run it in my boat with a 454 big block plus lawn mower and small gas motors .

Absolutely fine!

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