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I wouldn't mix fuel, besides isn't the diesel more expensive with a higher tax? It is here. Part of the cold weather drop, and it's really cold here, is the air is really dense making your already poor aerodynamics and large frontal aera a bigger penalty. Your best defense is to just slow down and your mileage will come right back. Most likely poor road conditions call for slowing down anyway.
I have cylinder deactivation on my 2008 Hemi and wish there was a tune to "lock" it in. It seems to deactivate at the slightest increase in throttle. Why not be able to hold it until say 80% throttle is applied which would put the motor in a better BSFC anyway. The general public doesn't like that delay and the common custom tune actually disables the deactivation alltogther to make it sound better. Silly people. Maybe GM trucks being more popular and plentiful with the deactivation we will see a tune that is more for economy (real economy, and not just a claimed added benifit of and extra 30 hp and higher shift points).
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