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Hybrid TechnologyUnique topics related to the 2010 - 2015 RX450H model hybrid drivetrain and other features/options found only on the RX450H. Please use the main forum for discussion about shared components with other third generation RX models.
My guess is because you run out of juice in about a mile and chances are unless you are going down a long continuous hill you are going to need the engine to kick in to charge them back up.
Also in the grand scheme of things, 1 mile is not going to make a difference when one tank goes 350
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