Fuel Watch | Oil, Gas, Diesel & State Tax Compare

Florida Gas Tax

38.6¢

Florida combined gasoline tax rate per gallon.

Texas Gas Tax

20.0¢

Texas state gasoline tax rate per gallon.

Illinois Gas Tax

65.3¢

Official Illinois gasoline tax rate per gallon for Jan. 1, 2026–June 30, 2026.

California Gas Tax

61.2¢

California state gasoline excise tax per gallon.

Oil, Gas & Diesel Market View

Readers usually want one simple answer: how does oil connect to gas and diesel? The quick version is that crude oil is the starting point, but the price at the pump also includes refining, transportation, storage, retail markup, and taxes.

One barrel of oil equals 42 gallons, so a barrel price in the mid-$90s means the crude portion alone is a little over $2.20 per gallon before anything else is added.

WTI Crude Oil

Gasoline Futures

Diesel / Heating Oil Futures

Brent Crude

Gas & Diesel Price Calculators

Use the calculators below to show readers a simple estimate based on crude oil prices. These are educational estimates, not exact state pump prices.

Gas Price Estimate

Oil Price Per Barrel Gas Pump Multiplier

Crude at $94.60/barrel is about $2.25 per gallon before refining, taxes, and markup. Using a 1.7 multiplier gives an estimated gas price of $3.83/gallon.

Diesel Price Estimate

Oil Price Per Barrel Diesel Pump Multiplier

Crude at $94.60/barrel is about $2.25 per gallon before refining, taxes, and markup. Using a 1.9 multiplier gives an estimated diesel price of $4.27/gallon.

Illinois vs California Fuel Tax Snapshot

Illinois and California are both known for high fuel-related costs, but the mix is different. Illinois’ official state fuel-tax schedule currently lists gasoline at 65.3¢ and diesel at 73.8¢ per gallon, while California lists gasoline excise tax at 61.2¢ and a diesel fuel tax rate of 97.1¢ per gallon. These numbers do not necessarily include every local charge or retail markup readers may see in real-world pump prices.

Illinois

Gasoline Tax 65.3¢ / gal

Diesel Tax 73.8¢ / gal

Look & Feel High-tax Midwest state

California

Gasoline Excise Tax 61.2¢ / gal

Diesel Tax 97.1¢ / gal

Look & Feel High-cost West Coast market

Fuel Watch Notes

Oil is only the starting point
Readers often divide oil by 42 and expect that to match gas. It never does, because crude is only part of the final price.
Diesel matters beyond the pump
Diesel often feeds into freight, shipping, and grocery costs, so spikes can ripple into goods and food.
State taxes are only one piece
Pump prices also reflect refining constraints, local competition, seasonal blends, and transport costs.
California and Illinois both feel expensive
Even when one tax line looks lower, total market conditions can still keep pump prices elevated.