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Wisconsin Diesel Hits Record High of $6.19

By Markets Desk · 2026-09-18 · 1 min read
A fuel pump nozzle resting on a concrete surface next to a puddle of spilled liquid
Illustration: Tradingbird

Wisconsin diesel prices reached an all-time high of $6.19 per gallon. Gasoline averages $4.34, up 23 cents overnight.

Wisconsin diesel prices reached an all-time high of $6.19 per gallon. The statewide average for regular gasoline stands at $4.34 per gallon. These figures represent a 23-cent overnight increase for gasoline. Diesel costs have risen nearly 60 percent over the past 12 months.

Political figures attribute the price surge to geopolitical conflict. They cite military escalation involving Iran as the primary driver. The closure of the Strait of Hormuz has reduced global oil supply by roughly 20 percent. This supply constraint directly impacts fuel costs in the Great Lakes region.

Legislators propose markup law repeal

Democratic candidates advocate for repealing the minimum mark-up law. This legislation sets a floor for distributor margins. Repealing it would reduce gasoline costs by $0.40 per gallon. Diesel prices would drop by $0.56 per gallon under this measure.

David Crowley and Sarah Godlewski support this policy change. They argue the current law exacerbates the economic burden on consumers. The proposal targets the structural costs embedded in fuel distribution. This approach aims to lower prices without direct government subsidies.

Price increases outpace annual averages

Current gasoline prices are 45 cents higher than a month ago. They are $1.45 higher than the average from one year prior. A year ago, the statewide average was $2.89 per gallon. Analysts predict further increases in the Great Lakes region.

Fuel margins have not yet fully reflected recent wholesale hikes. This suggests additional price adjustments are likely. The situation affects farmers, manufacturers, and truck drivers. Consumer spending power is under significant pressure from these costs.

Campaign rhetoric focuses on inflation

Politicians debate the root causes of the price spike. Some blame congressional votes on military spending. Others point to the structural inefficiencies of the mark-up law. The debate centers on which policy lever offers the fastest relief.

Source data from GN auto markets/energy: gasoline prices confirms the regional trend. The disparity between local and national averages is widening. Voters in Wisconsin face some of the highest fuel costs in the country. The political response remains focused on legislative intervention.

Based on reporting by WisPolitics, compiled by the Tradingbird desk.

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