18 thousand quid probably isn't gonna get him a V8 guys........unless if the resale is that bad over there.

The powertrain on the 3.0i is unchanged throughout the entire E53 cycle. Same M54 motor, 5-speed auto. You may be able to find a 5-speed manual (upgraded to 6-speed in '04) if you are lucky, although the gearing on that can be a bit short.

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2014 Mazda 3 GT: Ø Consumption: (click for details)