Here in PA, we have ag-approved, non-taxed diesel fuel, for farm use, and it’s dyed red/pink. If you get caught with it in a commercial vehicle, unless it’s a farm truck, it’s a fined offense. When I had my Family Farm Business, all my farming & construction equipment ran on it, but personal vehicles were gas-powered.
I am familiar with it because all the lobster fishing boats out on the ocean put out a different color exhaust than pleasure boats.