2006 Lexus RX 400h Long-Term Road Test


2006 Lexus RX400h: Highway Fuel Economy

May 15, 2008

A hybrid Lexus in its natural habitat...oh wait

Although our Lexus RX 400h long-termer has mostly been retired from the fleet and is now driven by non-editorial Edmunds folks, it occasionally falls back into our hands to make sure everything's running smoothly with the goal to test the long-long-term reliability of hybrids. After driving the RX to and from Willow Springs International Raceway, I'm happy to report everything is A-OK.

I can't really say the same about highway fuel economy, however. With cruise control set at 75 mpg there and back, I only managed 25.4 mpg (according to the trip computer).

That's actually 0.4 mpg better than the EPA's 2008-standard highway estimate, but somehow I think it should be better even if the electric motor never kicks in at highway speeds. Certainly, the 27 mpg city is very impressive given most V6-powered crossovers get between 16 and 18 mpg in the city, however, I'm pretty sure we've never come remotely close to that. In fact, when I got into the car, it reported to me that it was averaging 18.3 mpg over its last 550 miles -- and that's not with the editor's lead feet on its accelerator.

James Riswick, Automotive Editor @ 31,831 miles

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