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Being in a cold climate and having 18:1, I've always wanted to ask this. How cold have you started your truck in the winter without being plugged in? Naturally I'm not nearly as cold as you are being in New Jersey. I've started the truck at or slightly below zero. Although it made a lot of noise and smoked white for about 10 seconds, it had no problem starting. If I ever had to replace my engine I debated if I should use the stock compression or go with 18:1. I have plenty of power for towing and regular driving so it would not be a performance thing for me.
Also, I personally see no difference in mileage on winter or summer mix. I'm still getting 17-18MPH. Wonder if the compression has anything to do with keeping the fuel economy stable in the winter. I'm also probably not using the same winter mix as you are. Although it does occasionally get into single digits it's probably more common to be in the 20's and 30's during a "normal" winter, maybe 30% #1?
Art.
I have started the truck at -5F @ 5000ft elevation without being plugged in....It doesn't like it, but it will start okay after a couple glow cycles...