Hi all, Recently I've noticed a slight fall in fuel economy in my w124 300CE. Is it normal for this to happen in the cold weather? I have been flooring it, but only a little. Heaters are usually on full heat. Also, I seem to have a slight voltage fluctuation too. I've noticed that the interior/exterior lights glow stronger and also heater vents blow stronger upon acceleration but when coming to a halt (in 'D'), everything get noticeably weaker. Sometimes to the point where the engine cuts out and stalls. Any advice appreciated. Thanks!