Water/meth injection is mostly used on forced induction cars as it absorbs heat, lowers intake temperatures and adds knock resistance. I did go and look up in my user’s manual though to see if there was anything stated about methanol:

”Lexus recommends the use of cleaner burning gasoline
Cleaner burning gasoline, including reformulated gasoline that contains oxygen- ates such as ethanol or MTBE (Methyl Tertiary Butyl Ether) is available in many areas.
Lexus recommends the use of cleaner burning gasoline and appropriately blended reformulated gasoline. These types of gasoline provide excellent vehicle perfor- mance, reduce vehicle emissions and improve air quality.
■ Lexus does not recommend blended gasoline
● Lexus allows the use of oxygenate blended gasoline where the oxygenate con-
tent is up to 10% ethanol or 15% MTBE.
● If you use gasohol in your Lexus, be sure that it has an octane rating no lower than87.
● Lexus DOES NOT recommend the use of gasoline containing methanol.”

So scratch that idea, it was just a thought. Hopefully no one rushed to install a W/M injection kit from my post. 😬

Depends on your driving but a W/M injection kit is about $500-600 and no more complicated to install than nitrous. But none of that really matters since Lexus doesn’t endorse its use or anything other than straight gas and up to a 10% mix of ethanol with straight gas. The water and methonal mixture is something like a dollar and many people just use their windshield washer fluid reservoir. Windshield washer fluid is already a mix of water and methanol and sometimes other chemicals like ethylene glycol. You’d just need to make sure you get one that is water and methanol only and the mixture is usually 1:4-1:2 methanol to water.

But Im no longer suggesting a water meth kit since the OM clearly states Lexus doesn’t endorse that.

Snow claims water meth changes 91 octane to an effective rate of 116 octane. So of course it won’t increase performance like being able to add 5-10 more psi on a forced induction setup. But if you’re running 91 octane and it’s 95° outside there’s still a good chance you’d benefit from a higher octane rating.

with regards to the manufacturer not endorsing 30% ethanol there’s far more involved like the seals and components that are not made to operate on that fuel. Lexus wouldn’t endorse a careless mufflerless exhaust system because they can’t legally. They would recommend tunes because that takes to reliability out of their hands but leaves all the liability in those same hands. Same with superchargers, nitrous, etc. The fuel thing is quite different in that it’s not a control issue but a materials issue.

I
So
Fried

☺️