Don’t have my car yet but are there any thoughts on using an octane booster additive instead of premium 91 fuel?

Thanks for everyone’s insight, I enjoy learning from all of you!

 

Don’t do it. The amount you would have to use would probably cost more than just using premium, not to mention the inconvenience. If you are buying a new Lexus the cost of fuel should be considered. If the door over the gas cap says premium use premium. You may also potentially be heading down the road of expensive repairs and voided warranty as well. I’m not trying to be ugly, but proper maintenance and care are key to a long, happy ownership experience.

 

All good points. Thanks.

 

Note that the specifications say 91 octane minimum or higher. Research and testing was done with 96 octane to get better performance results. You can still add octane booster to premium fuel when you want some extra performance out of the vehicle. Using the bare minimum 91 is alright for everyday but it's nice to feel that extra punch on occasions. I'll add a bottle on a weekend road trip and switch car over to sport+ but for workday traffic jambs I don't see the point of higher​​​​ octane levels. A bottle of booster is convenient to upgrade a fuel tank quickly but I'd never put anything less than 91 octane at the pumps. I always keep a box of Lucas Octane Booster in the garage for that convenience.

 

I think this depends on what country you are in and what number they are putting on the pump.
RON, MON, and AKI are different measurements.
In north and cental Americas it is AKI which is the mean between RON and MON. (R+M)/2 you can see this on the pumps.
Europe and other parts of the world use RON.

91 AKI (as stated on pumps in the US) is the same as 96 RON (Europe)

I'm speculating that when the test was done with 96 that was RON. Which is essentially the same as 91 in the US.
The pic suggests this. It would be more clear if they used 2 columns for AKI and RON instead of using ().