I agree with this logic; everyone has theories. Why would Lexus recommend premium if it wasn't really needed? Are they in cahoots with the petroleum industry to sell higher priced fuel??? These are rhetorical questions because I will also use the manufacturers recommended grade fuel. The possibility of damaging the engine is too much of a risk for me.

 

 

I would not run regular in a turbo engine, even a stock one. I keep at least 108 Motor Octane in my Supra, and often 112 -116. Then again, I typically run 30-35 PSI boost, so the effective compression ratio is very high, and there's a lot of thermal load on the engine under maximum output.

 

Sorry, still anecdotal. Where are the facts, supported by scientific testing. Just one example, "Don't think this will void your warranty." Someone show me a test done on a dyno about how much horsepower is or is not produced and what the fuel consumption is. Then I'll begin to believe the car companies are wrong. Need so life of the car testing also. The impact may be small. Then a statistical analysis of the data so others can repeat the experiments. Otherwise it is all just internet gossip.

 

And even more "internet gossip" about regular gas destroying the engine. Any real time info on number of engines destroyed?

 

Perpetual argument. Just every one do whatever one wants with one's own vehicle. gasoline, oil, tires,etc., etc. Let's move on to some other
meaningful issues. For me always I fill with Shell premium to keep my car's engine clean having DI engine. No comment please.

 

To be clear, the Tundra/Land Cruiser/LX 570 engine is not a direct injection engine.

 

Based on availability at the times I need to re-fuel, I have run all grades of gasoline. I just do not subjectively feel any difference, even when towing my horses.
What objectively makes a difference is when running ethanol-free gasoline. With it I get 3+ miles more per gallon, based on the display screen. What is really nice is that increased MPG with ethanol-free for me translates into around 60 more miles of range.

About 300 miles range with ethanol bend vs 360 with ethanol-free..

 

The engine ECU adjusts for whatever gasoline you use. I run 91 octane Sinclair ethanol-free...definitely kinder to the rubber in the fuel system

I've towed a 3-horse Charmac with a 17 hand hunter and a 15 hand appendix. No issues whatsoever, but I definitely wife's 3/4 ton Dodge with Cummins.

 

I would expect more MPG with non Ethanol because ethanol provides less energy than pure fuel when burned.

 

The amount of heat energy in gasoline as compared to ethanol on a volume to volume bases is well documented and supported with facts. Having said that, my turbo charged Audi S8 does not achieve the 3mpg increase I see with my normally aspirated vehicles.

 

Sorry if this has been covered before, and I did do a search.

I'm looking for one of these and know the gas mileage is bad.

Its V8 is identical to the Tundra's 5.7 which calls for regular. There are zero differences; the compression ratios are identical.

I don't mind driving a gas guzzler but I really don't want to waste $12-15 bucks a tank on high octane fuel if I don't need to.

Does anyone here run regular? I wonder what the service techs at the dealer would tell me. Or the Toyota dealer.

 

No!!!! Not again!!! :-D
LOL, this post will be very popular!
BTW, not important at this moment, but I think that you are right and regular is O.K. for your LX.

 

Lol, sorry. I originally wanted a GX and there's sort of a debate there too, but there actually is a difference in the compression ratio between the 4.6 in that and the 4-Runner V8.

The LC/Tundra/LX engines are literally identical, down to every spec.

 

Sigh.... You need the premium fuel to unlock those extra 2 horsepower.....