Florida gas prices are the highest they’ve been in four years with state averages peaking at $4.23 per gallon.

Prices surged $0.28 last week before declining $0.03 through the weekend, according to AAA – The Auto Club Group.

Sunday’s state average of $4.21 per gallon is $0.25 more than a week ago, $0.97 more than last month and $1.01 per gallon more than this time last year.

“The average Florida driver now pays about $20 more to fill up than a month ago,” said spokesman Mark Jenkins.

Jenkins said the rise is due to oil prices “as the conflict in Iran disrupts global fuel supplies.”

Florida gas prices have jumped as much as $1.35 per gallon over the past month, rising from $2.88 per gallon to more than $4.20 per gallon.

The most expensive metro markets are West Palm Beach-Boca Raton ($4.35), Gainesville ($4.28) and Naples ($4.27).

The least expensive metro markets are Pensacola ($3.91), Crestview-Fort Walton Beach ($3.91) and Panama City ($3.92).