2015 RX450h has 65 liter fuel tank vs. Bimmer X5's 85 liter. I used fill up every week when I had X5 with Octane 91 Shell. Now I fill up every two weeks. I don't bother checking MPG. Starting new year they added 4.9 cents per liter carbon tax. dollar or two extra when filling up.

 

I have the 2015 RX450. It does have the newer grill that is solid and not cheap to the touch,and not the grotesque cheap example of the over design of the 2016. Love my 2015 in all,respect. My mpg is holding at 24-25 in 10-20 degree temps in Buffalo. I'm more than happy with theat. When I had my 2013 RX350 my mpg in the same conditions was 10-12,in town driving. Summer was about 16-17 tops. That's why I went to the Hybrid.

 

ls

i see you have the same wheels as my 2015 450 h. They came out in 2015. Dealer did you a favor-- the original wheels were no where near as nice.

 

Mysteriously, my in-town driving MPG has gone down to 23 mpg area. Nothing different in my driving pattern and route. Yet, over the weekend, I went up to the mountains using about 90% highways, and achieved 25.5 mpg in sport mode. Cruise was set at 75mph but avg speed was probably in the high 50's due to traffic and stuff.

My car is doing the complete opposite of what a hybrid should be doing which is to get great mpg in the city. yet nothing shows up on the dash regarding the hybrid system. I'd like to take it to the dealer but don't want to waste my time at a dealer giving me blank stares as if they just entered kindergarten for the first day. Of the three dealer dealerships around me, 2 of them have F rating on BBB. The best one has a C- rating.

Anyone know an indy shop in northern Los Angeles area who can check out the hybrid system better than the kids over at the dealer?

 

I have a UK 2010 RX450h and my mileage has averaged at 33 mpg since i bought it in December. I know our gallons are different to yours. 70% town work and 30% on longer runs. They advertise it here as 42mpg overall but I can't see that being achievable. Presumably the warmer summer conditions should see an improvement. I generally run it in ECO mode.

 

Ouch. That's awful.

 

One of the dealer just moved up to D- rating. https://www.bbb.org/losangelessilico...s/?review=true They must be jumping up and down with joy and patting each other's backs.

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On a different note, my friend drove my car down to San Diego (with me in it) from Los Angeles and recorded 27.5 mpg using his heavy foot. He kept the cruise at 75 mph and had many bursts above 90 mph around Camp Pendleton area. All done in S mode.
Still scratching my head about Lexus claim of higher MPG in city driving......

 

My highway mileage is steadily climbing. I can easily hit 30-31 mpg in the city. I have 9,000 miles so far.

 

Driving in S mode and expect you'd get best MPG. May be in ECO mode and light foot, lots of coasting... I just drive not caring much about MPG. One thing MPG drops
in cold weather for sure. My last car '15 Bimmer X5 has 85 liter fuel tank vs. RX's 65 liter one. I used to fill up the Bimmer every week, I fill up the RX every two weeks.

 

Your city/highway numbers definitely seem bass ackwards as they say. 21mpg is the very, very worse I've ever gotten in the city, and that was from short trip, brutal cold, blizzard like conditions. This winter has been fairly mild, floating above and below freezing day to day and I've been getting about 25-26mpg (summer is about 28-29 for me). Getting 27-28 on the highway is very tough for me, unless it's very level or a lot of gradual down hills, I'd have to keep it steady under 65.

 

In the city, the car benefits from recovered energy normally wasted during braking.

Whereas on the highway, there's (relatively/nearly) no regeneration going on - and the efficiency of the ICE is hampered by the process of converting somewhere between 3/4 and 2/3 of the ICE's energy into electricity (somewhere around 95% efficiency), then converted into 3-phase (somewhere again around 95% efficiency during that process), and then storing energy into the battery and/or converting that energy back into torque (again around 95% efficiency).

(Think of it like: 31 MPG x .95 x .95 x .95 = 26.6 and you can see where some of your MPG goes.)

One would expect higher efficiency of the ICE on steady highway speeds - and, it is - only there is loss in all of the conversion processes -- and that's where your mileage "suffers".

For those of us whose daily operation favors stop and slow traffic - the hybrid's the (seemingly) logical choice.

From what I've been able to discern, the mode for the "combined" MPG of the 350 series is around 21 MPG; whereas the mode for the MPG of the 450's is more like 26.5 MPG -- and while the 5.5 MPG as a number isn't remarkable - that it represents an extra 26% is noteworthy.

Unfortunately, that 26% mileage increase comes at a 30% price penalty for the Premium Fuel (at least here in Florida).

(Here's where the "I always run Regular in my Premium-Fuel-Required car" guys always chime in.)

 

scrarch no more. I have had 5 hybrids. 2007 Camry,2008 Prius,2010 Prius,2011 Kia Optima and now the RX450 h. Every vehicle gave me higher MPG highway by far. City was very good but highway was always superior by leaps and bounds.
.

 

I finally figured out what makes my HW and Local dirving MPG numbers look all funky. As it turns out it's the elevation change that is causing the most of my problem. Recently, I stayed at a location that is about the same as my work address elevation. Sure, there were some rolling hills and such but it wasn't as drastic as my daily commute. I recorded 28 mpg. that's like 15 to 20% difference from what I usually get.

To get home (on my normal commute), there is a final stretch of 9 miles starting from 520 ft to 2000 ft all straight up without dipping down. I was under the assumption I'd "get it back" on my way down the opposite way the next morning but that is not the case. The battery only charges to a certain point, then, the rest of the regen energy is not captured.

this explains the reason why I got such good mileage driving at 75 mph on the highway - Los Angeles to San Diego highway miles are all flat - pretty much close to the beaches - read: sea level. So, even though the published reports don't say as much as about mpg in hilly driving, I can say confidently that elevation change has more to do with MPG than simply categorizing your mpg by highway or local driving.

 

Also cold winter affects a great deal on MPG. In the winter where I am, Calgary Alberta, elevation ~1000 feet. Winter time the MPG drops to like regular RX. Not much
saving there. Now it is spring weather which improves MPG making a difference.

 

I believe winter mileage is also reduced due to the winter gasoline blend. In Oregon, my 2016 RX450h and 2010 Prius MPG drops 3-6 mpg. I believe the refiners change to summer blend in early April, so I'm expecting mpg will go back up on my next fill up. The Prius has already increased 3-4 mpg over the course of 200 miles since its last fill last week.