That issue is being raised, but whether politicians address it remains to be seen. Politicians love tax money ..
"While the plan to implement tolling as corridors are modernized addresses one of the highway user community’s concerns about tolling, the study ignores legitimate concerns about “double taxation”—paying both tolls and fuel taxes for the same corridor. The study acknowledges the coming need to replace fuel taxes with mileage-based user fees (MBUFs), but it ignores a key tenet of the ongoing state pilot programs: that the mileage-based user fee is intended to replace the fuel tax, not be charged in addition to it. What would fix this problem is to make the new Interstate tolls Michigan’s first MBUFs. That would mean providing refunds/rebates for fuel taxes incurred for miles driven on the newly tolled Interstates, demonstrating that MBUFs really will be replacing fuel taxes when implemented."
"Michigan DOT and legislators might be concerned about the cost of providing fuel-tax rebates, but the study itself recommends devoting 5% of gross toll revenue to various kinds of toll discounts and rebates, some of them highly questionable. In a peer-reviewed study just published in Transportation Research Record (the journal of the Transportation Research Board), I used a detailed spreadsheet model to estimate the net present value (NPV) of fuel tax rebates to motorists and truckers driving on rebuilt, tolled Interstate corridors. The NPV of state fuel tax rebates over 30 years was less than 7% of the gross toll revenue."
"While the plan to implement tolling as corridors are modernized addresses one of the highway user community’s concerns about tolling, the study ignores legitimate concerns about “double taxation”—paying both tolls and fuel taxes for the same corridor. The study acknowledges the coming need to replace fuel taxes with mileage-based user fees (MBUFs), but it ignores a key tenet of the ongoing state pilot programs: that the mileage-based user fee is intended to replace the fuel tax, not be charged in addition to it. What would fix this problem is to make the new Interstate tolls Michigan’s first MBUFs. That would mean providing refunds/rebates for fuel taxes incurred for miles driven on the newly tolled Interstates, demonstrating that MBUFs really will be replacing fuel taxes when implemented."
"Michigan DOT and legislators might be concerned about the cost of providing fuel-tax rebates, but the study itself recommends devoting 5% of gross toll revenue to various kinds of toll discounts and rebates, some of them highly questionable. In a peer-reviewed study just published in Transportation Research Record (the journal of the Transportation Research Board), I used a detailed spreadsheet model to estimate the net present value (NPV) of fuel tax rebates to motorists and truckers driving on rebuilt, tolled Interstate corridors. The NPV of state fuel tax rebates over 30 years was less than 7% of the gross toll revenue."