I found:
Fuel tank capacity: 17.2gal/65l.

 

So it looks like lexus is being conservative about fuel remaining to protect the user I guess lol.

Also, im getting 21.5 MPG combined driving in NYC. Im also driving a bit spirited tho, in normal mode 90% of the time.

Still have less than 100 miles so im sure its breaking in.

 

I'm hoping to hear around the 25/27 mpg from owners before I get mine.

 

Today's trip was 26MPG according to the notification you get when you turn off the car every time.

 

Now, 26 mpg is good news.

Some others have been reporting 20 mpg, which had me worried (just a bit).

My order still stands, my salesperson hasn't notified me as to when it might arrive yet.

 

Doesn't the hybrid request Premium gasoline also? I didn't realize that the hybrid only needed lower grade.

 

The 500H should run premium; the folks with the 350H are still discussing that point.

 

Well, according to the Owners Manual: RX350h: Recommended to use
premium unleaded gasoline with
octane rating of 91 (Research
Octane Number 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. Use of octane
rating unleaded gasoline with an
octane rating lower than 87 may
result in engine knocking. Persistent knocking can lead to engine
damage.
RX500h: 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.

So with the 350h it seems to be up to the owner, whereas with the 500h it must be premium.

 

Must be nice having your gas mpg this high. I wish I would've gotten the hybrid!

 

The RX500h hybrid requires premium. The RX350h hybrid can run on regular. Premium is recommended but not required. I haven’t seen any posts where any owners use premium with the RX350h.

The EPA combined city/mileage is 27 premium gas MPGs for the RX500h and 36 regular gas MPGs for the RX350h. Once you adjust for the 20% higher cost of premium gas for the RX500h, it is equivalent to 21.6 regular gas MPGs…call it 22MPGs. Put another way, the RX500h hybrid costs 63% more to fuel than the RX350h hybrid. And about 10% less to fuel than the RX350 non-hybrid, which gets 24 premium gas MPGs.

 

I understand that the cost of fuel is important to some, but obviously, not those who order the 500H.

If you are going to shell out the cost of a hybrid (especially the 500H) the cost of fuel is a small consideration.

The fuel economy of the 350H and the extra power of the 500H would be an optimum package.

 

Agreed on all points! I’m just laying out the fuel cost facts.

 

Owning a few thousand shares of a major oil company would be nice!

If I had oil stock, I'd keep quiet about people not caring about MPGs. And I wouldn't drive a hybrid!

 

Since I just placed my order for a Copper RX500h as my daily driver with Lexus of Albuquerque I want to thank you for this. The mileage and/or miles to empty on a vehicle's computer is notoriously incorrect. Typically close but not exact. The only way to find the actual milage is to calculate it the 'old fashioned' way as you have done. Doing this, however, falls into the high-level math category for most people!

You calculate out to a 28.4 mpg. Very respectable and seems to confirm the milage claimed by Lexus. All the discussions here about premium vs regular gas are moot since Lexus actually recommends premium fuel for all their hybrid RXs.

 

I think you mean "moot". Anyway, the claims are not "moot" because the RX500 has premium gas REQUIRED while the RX350h it's only "recommended". And the RX350h mileage being reported here is almost always, to my knowledge, by people running on regular, getting what the EPA number is. No one here, so far, has reported running the RX350h on premium gas. So you DO have adjust about 20% for the RX500h and RX350 (non hybrid).