No problem. I add the regular amount starting about now, then out of paranoia double it when the temps are first drifting down to 10F at night. I keep it there at double until it has stayed cold for a month.
Sounds goofy, I know, but the fuel stations will always go lean on the additives early in the season to save money betting that it won't get cold and won't matter. So, doubling protects against them basically not treating at all. After a month of cold, they will have their collective "stuff" in a bucket, and it's safe to go back to label dose. I do start dosing early, because us WI people know how fast a cold snap can blow in. It's the boy scout in me.
Sounds goofy, I know, but the fuel stations will always go lean on the additives early in the season to save money betting that it won't get cold and won't matter. So, doubling protects against them basically not treating at all. After a month of cold, they will have their collective "stuff" in a bucket, and it's safe to go back to label dose. I do start dosing early, because us WI people know how fast a cold snap can blow in. It's the boy scout in me.