For those of you driving in temperatures below 20deg., what kind of mileage are you getting? It was 4 deg. this morning and I had a really hard time keeping 50 mpg. I have a manual with 240,000 on it. I drive mostly freeway speeds (50 to 65). Very few lights. I use Mikes' battery charger to maintain. I changed the spark plugs last night thinking this would help and it's only the second time (that I know of) that they have been changed. It made no difference.