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I've found the same, in Highway driving on relatively flat terrain the fuel consumption is quite low. However, daily drive to work (traffic bogged highway, averaging maybe 30-40 mph) is totally different story - about 15 mpg. Oddly enough, on the same commute I got better gas mileage with the F-Type R which had a supercharged V8 with 100 more hp. I guess the better lower end torque of the Jag meant it didn't work as hard as the M550i.
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