food for thought, how much are you really saving by not starting and stopping on diesel? after the exta strain on your starter, battery's, gp's, and not to mention when your engine is cold even if it's plugged in there is going to a massive percentage of extra unburnt carbon till the engine "seals up". I'm all for saving a buck, but at what cost?
personally I have a back tank or normal diesel that i start and stop on. then run my front tank with a mix, generally in the 65-75% in the winter.
I cut my wmo with diesel and some gas not over 5%. I don't use gas every time just when I have it laying around
on a side note I feel like once you go over the 85% range even in the summer it's to smoky, it has to be filling your rings and gumming up your engine over that percentage.