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RX450h US vs UK fuel consumption discrepancy

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Old Aug 26, 2012 | 04:09 PM
  #1  
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Default RX450h US vs UK fuel consumption discrepancy

Can anyone explain the discrepancy between the fuel consumption in the 2013 US RX 450h and the UK version of this vehicle?

Specifically:
US: 28 / 32 and UK 43.5 / 47.1.

Specs:
US RX450h
UK RX450h

Last edited by RxRPh; Aug 26, 2012 at 04:22 PM.
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Old Aug 26, 2012 | 04:40 PM
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http://www.mpgtokpl.com/mpgtompl.htm
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Old Aug 26, 2012 | 05:27 PM
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Sorry, I should have mentioned in the original post that I am aware of the difference in the volume between the US Gallon and the Imperial Gallon. However, even taking this into account, there is a considerable discrepancy in mpg.

The ballpark conversion for US 28 mpg is 33.5 UK mpg - still a discrepancy of 10 mpg.
For US mpg 32.0, the conversion amount should be 40 UK mpg, 7 mpg less than that seen in the UK Lexus specs.

Overall, there is a 8-9 mpg difference in favor of the UK model. What could explain this difference?
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Old Aug 26, 2012 | 05:34 PM
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It is due to the rating system that the UK model uses. the EPA used to do testing that was not really representative of the real world driving so they changed the way they test vehicles a few years ago. The UK system is outdated and is not representative of the real world
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Old Aug 27, 2012 | 05:52 PM
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http://en.wikipedia.org/wiki/Fuel_ec...in_automobiles
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