Using 20' USB extension from PC, OK?

[C6ect.ect]

I don't have access to a portable computer so I've been using a 20' USB extension to reach my car in the garage. This basically added connection points within the signal between PC and ECU -

will this be OK?

About 6 or 7 flashes so far.

Thanks

Here is my map for methanol injection, what do you think?