December 26th, 2005 
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Porsche Cayman has a higher mileage than BMW Z4 2.5si, 3.0i And 3.0si?
Searching on the Internet I found that the gas mileage of a Porsche Cayaman (in most European sites, ex: http://www.porsche.com/spain/models/cayman/cayman/featuresandspecs/ ) is rated as 13,8 ltrs/100kms(city) and 6,8 ltrs/100kms (highway) while in the BMW International Website ( http://www.bmw.com/com/en/index_low.html ) you'll find this figures(for the 3.0si): 12,6 ltrs/100kms (city) and 6,3 ltrs/100kms (urban). The other models, 2.5si, 2.5i are much more "fuel-saving" than the 3.0si. So my question is ¿why does Porsche of USA claims that the Cayman does 23 mpg and 32 mpg (city - hway, respectively) whilst in American/European/Anymarket BMW always claims the same figures: 20 mpg / 30 mpg (or 12.6 ltrs/100kms and 6.3 ltrs/100kms) for the Z4 2.5Si when clearly as seen in the links above the Z4 has better mileage than the Cayman, while in Yahoo! Autos because of the figures given from Porsche USA it seems as if the Cayman has higher mileage? Thanks to the ones responding.
Here's your answer - there is no Z4 2.5 in the US. The Z4 is only offerred with the 3.0 in the non M models - in two forms, one with 215 and one with 255 hp. We don't get the more efficient Z4 here.
the base Cayman is a 2.7 in the US.
Generally speaking - smaller engine + better aerodynamics (I would think) would get you better mileage.
http://www.bmwusa.com/vehicles/z4/Z4Roadster30i/default
http://www.porsche.com/usa/models/cayman/cayman/featuresandspecs/
Madness MINI Cooper S vs. Porsche
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