Well - the car isn't broken in quite yet so I've been a bit easy on it but you can definitely feel a difference. I always felt that the 330 was just a touch underpowered for my liking.

When I test drove the 350 I did feel like the engine was much more powerful and if you actually pushed the engine you might damage the suspension if you weren't careful

In a few more miles I will start to put the 350 through its paces and we'll see then. So far though - it's had all the power I've needed and I've not once felt that I needed more.

Hope that helps!

Jay

 

Our 05 RX 330 regularly gets 24-25mpg at 75mph. It is a 2wd version. Running 65 mph it gets almost 28 mpg. These are all trip highway mpg. We use regular gas. It does not get much better mpg with plus or premium. It has 20.000+ miles on it.
I'm happy that the 350s are getting about the same or better mpg. This is our third RX (98 & 2001) and we are not interested in changing brands/model when we trade in 08.