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Avg 19.5 mpg combined sub-urban (many hills) and hwy driving or roughly 350 miles until empty light. AC on 99.9% of time during summer and heater on 99.5% of time in winter.
* Regularly check tire pressures
* Remove any unnecessary weight
* Run the AC and heat as little as possible (I realize this is sometimes not very practical)
* Use premium fuel only in your RX350. What it is designed to run on. Unlike the RX330, the 2nd Generation RX350 really needs premium fuel.
* Make sure to use a 5W20 or 0W20 weight motor oil
Here in the states our fuel has 10% ethanol which has a negative impact on fuel mileage. If you do not have ethanol in your fuel you may do better.
The short trips, naturally, will kill your fuel mileage.
I have an '08 RX350, use premium fuel, and drive a mix of city and highway. I drive extremely conservatively and usually get between 21 and 23 mpg using manual calculations (the car's computer overestimates fuel economy by up to 1 mpg sometimes).
The area I live in has lots of hills, and try to coast down them as much as possible (and maintain constant acceleration when going up them), sometimes putting the car into neutral if traffic allows. I try to use cruise control as much as possible on roads that don't have many stop signs or lights. I've found that by doing this, and I can get around 400 miles per tank (I consider anything over 400 per tank success).
Car maintenance certainly has a part in achieving and maintaining good gas mileage, but I find driving style matters the most. When my girlfriend drives the car, the mileage goes down considerably (much to my chagrin) just due to her more aggressive driving style.
My awd 2008 gets about 17 mpg in town and around 25 on the highway at 75-80 mph. I use 93 premium. Michigan does't sell 91. So my choices are 89 or 93 octane.
My 2006 rx330 gets 25 MPG ( 4.5L = 1 CA gallon) AWD. It's a 5 SP Auto. I think the RX350 has a extra gear, 6 so the mileage should be a bit better. I use premium fuel which is what is recommended for the 2006 RX's.I'm very happy with the MPG. jamie
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