Article Comments- 2010 Lexus RX 450h First Drive

3 messages, Last post on Mar 11, 2009 at 8:58 PM

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What is this discussion about? Lexus RX 400h, Hybrid Cars, SUV

2010 Lexus RX 450h First Drive - First Impressions: With subtle gains in fuel-efficiency and refinement, the RX 450h is better than the RX 400h, but not dramatically so. (more)

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#1 of 3 Article Comments- by KarenS HOST Jan 27, 2009 (11:32 am)
Our off-road driving route in the 2010 Lexus RX 450h takes us through a neatly manicured meadow bordered by Chardonnay vines. As we ascend a small rise, our right foot resists hypermiling protocol and the hybrid RX's new 3.5-liter V6 starts up, breaking the electric-only silence. Otherwise, the RX 450h shrugs off the adventure and delivers us to the winery's tasting room with nary a dirt clod on its 18-inch wheels. 2010 Lexus RX 450h First Drive Replies to this message: wwest (Jan 28, 2009 10:47 am)
#2 of 3 Re: Article Comments- [KarenS] by wwest Jan 28, 2009 (10:47 am)
Replying to: KarenS (Jan 27, 2009 11:32 am) Is the 12.5:1 compression ratio quoted for the hybrid the net, effective, compression ratio or is it only the "native" (before Atkinson "derating") cylinder compression ratio...?? An effective 12.5:1 would imply DFI, Direct Fuel Injection, for which I haven't seen any notification in the materials. And I have been of the understanding that converting a V6 to the Miller cycle was possible but not so for the Atkinson cycle. Does anyone know how Lexus has implemented the Atkinson cycle on a V6..?? And 2.5 TONS for a F/awd RX450h....?? Given the weight trim provided by the new awd(?) system what is the comparable weight gain/(loss??) for the F/awd RX350....??
#3 of 3 NavTraffic fact-check... by excelsior88 Mar 11, 2009 (8:58 pm)
"Nav traffic has been conspicuously absent from the Lexus lineup; the RX crossover is the first model to get it." What about the LS 460 which added NavTraffic in 2006?