Is this an academic exercise?
The great majority of people buying luxury cars do not concern themselves with MPG, the manufacturers take it for granted that if one can afford
their product one can also afford the fuel. Now here in this forum many are concerned about this but we represent a very small speck of the buying public!
Maybe we can talk again in a while if the price of fuel keeps going up.

 

Nope. Not just academic. I wanna know what I’m getting into. Will the new RX cost more to fuel than the old RX?

 

I believe this is why Lexus 'recommends' premium, but does not 'require' it on some of their engines. If regular is used, power drops to Toyota specs for that particular engine. We won't know what the requirements for the new RX are for sure until it is released. A little less power in this class of vehicle probably won't matter or be noticed by most owners of the RX.

 

Isn’t 91 octane REQUIRED for this engine in the NX?

 

Yup 2.4L Turbo in NX is 91 REQUIRED

 

To clarify my previous statement, looks like it may depend if it is a hybrid or not. For the NX350, premium required, NX350h, recommended but regular can be used.
Per the owners manuals:
NX350:NX350: Select premium unleaded gasoline with an octane rating of 91 (Research Octane Number 96) or higher required for optimum engine performance and fuel economy. If the octane rating is less than 91, damage to the engine may occur and may void the vehicle warranty.
NX350h:Recommended to use premium unleaded gasoline with octane rating of 91 (Research OctaneNumber of 96) or higher for optimum engine performance. You may use unleaded gasoline with octane rating as low as 87 (Research Octane Number of 91). In this case, engine performance may be decreased.

If the same holds true for the RX, the hybrid version should be able to run on regular.

 

Yes, RX 350h only. I assume RX 500h would follow RX 350 for fuel recommendations

 

From what I read here, the new RX base engine will get 24MPG vs 23MPG for the current:

http://www.thecarconnection.com/over...r%20all%20four

So it's 24MPG on premium gas vs 23 on regular gas now. The new vehicle will cost about 10% more to fuel. This might be a deal breaker for me. It just irritates me every time I buy gas.

 

Plus the fact that they really haven't changed much other than stuffing a smaller engine under the hood which requires premium fuel?? Fuggetaboutit

 

RX5 is a completely new car. They changed everything.... Different platform, longer wheelbase etc...

 

SO THANKFUL WE PULLED THE TRIGGER ON THE MRS. 2022 RX350L. AWD 6cyl.

 

I get that but to the average Joe, it doesn't look different and with no more V6 and the trade off being a new infotainment, I'm not in a rush to make the trade.

 

Apparently inside it's like the NX only with better quality.

 

What is the sub-par quality issue(s) in the NX?

 

I didn't say that the NX was sub-par only that the RX being one notch up in price is of better quality.