Can I use dyed fuel? Good question and it relates to taxes.
The Wisconsin Department of Revenue (http://www.revenue.wi.gov/) updated Publication 307 Motor Vehicle Fuel Tax Information in 2015.
The publication is available here: http://www.revenue.wi.gov/pubs/pb307.pdf See Appendix B.
If you have additional questions related to use of dyed fuels, please contact the Wisconsin Department of Revenue ((http://www.revenue.wi.gov/)
Madison Office Location
2135 Rimrock Road
Madison, WI 53713
or write to:
Excise Tax Unit
Wisconsin Department of Revenue
PO Box 8900
Madison, WI 53708-8900
Telephone (608) 266-6701
FAX (608) 261-7049