Years ago, adding some gasoline to diesel was considered a valid fuel treatment in the winter. Can't remember the ratio but it was a lot higher than .5 gal in 26.
I'm on my 2nd one (1st was a company truck). I wouldn't buy another one on a bet. My current ride is a 16 model bought 'certified' with 24,000 miles on it. Went into limp mode the day after I got it home and has done so 2 more times since. I was a national sales mgr in my previous career and...