jmanatee2
Gold Member
It depends on your area. In CT right now HHO is 3000 ppm sulfur and off road diesel is ULSD, the same as on road diesel but with dye added. As of this summer HHO is going down to 500 ppm sulfur (LSD) and its supposed to go to ULSD some time in the future.
Where did you get this information? I am in CT and been using HHO for a while... I was always told it is dyed diesel.