The 6 Series might look like it should instantly be in the £25 congestion charge category, but choose the right engine and it easily avoids it. By right engine we're talking about any powerplant except the flagship 4.8-litre V8 of the 650i and the screaming 5.0-litre V10 of the M6. Their omission doesn't mean that you're limited to the lowly engines in the line-up though, as the fantastic 3.0-litre twin-turbo six-cylinder diesel engine comfortably manages to slot into the £8 a day category with its remarkable 183g/km CO2 emissions.
BMW as a whole has one of the lowest average CO2 ratings among its prestige rivals; however, even we were surprised to see that the 155mph capable 635d was so comfortably in the lower price bracket. It's an awesome car too, with mid-range muscle that gives it ridiculous pace. All this in a package that escapes a £125 a week charge to drive into London. Put the £85 congestion charge you'll save with the 635d each week over its 650i relative in the fuel tank and you could convince yourself you're motoring for free. Sort of.
Tuesday February 19
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