INDIANAPOLIS (WISH) — Prices for regular unleaded gasoline were down more than 15 cents a gallon on average Friday, barely 48 hours after the governor suspended all gas taxes.

Indiana levies two taxes on gas. One is a use tax, which serves as the de facto sales tax. That tax is calculated monthly and is set at 23.3 cents per gallon for May. The other is the excise tax, which is set annually and is 36 cents per gallon for this year.

Gov. Mike Braun suspended the use tax on gas in April in response to price spikes caused by the war with Iran.

On Wednesday, he renewed the use tax suspension for another month and also suspended the excise tax, which had remained in place.

Prices have already begun t...