I had to laugh looking at the Millers blurb
"User Benefits New pleasant citrus fragrance"
Its absolutely disgusting.
If you guys use the 5L containers, what is the best way to store and transport the amount your going to stick in the car?
I have 2 x 50mL graduated polythene centrifuge tubes. I put 100mL in a tank in the winter, will put 50mL per tank in the summer, but right now i'm putting about 70mL in. You don't have to stick it in on fill-up, but if you have it in the car when you do fill up, best chuck it in and then fill to get an instant mix. If you stick it in after your last trip of the day when getting home, it will mix overnight easily.
The stuff does have an evil smell. As a chemist, I have smelt many nasty chemicals, but this stuff is pretty bad, not as bad as pyridine, but close!