More states see prices inch over the $1.75 mark as scheduled maintenance and reductions in regional supplies push pump prices up.

The first week of March saw a national average gas price jump of six cents—the largest one-week increase since the beginning of 2016. As of March 7, the national average was $1.81 per gallon.

According to a March 7 report by AAA, the national average is expected to continue to increase as we move toward spring refinery maintenance season combined with reductions in supply in several regions.

Pump prices are above the $2 per gallon benchmark in five states. Hawaii ($2.54) continues to have the highest pump prices, followed by California ($2.45) Alaska ($2.16) Washington ($2.10) and Nevada ($2.04), AAA reported.

Only 20 states are posting gas prices at or below $1.75 per gallon—compared to 31 states that were reporting such lows just last week.

Arizona ($1.55) and South Carolina ($1.55) boast the nation’s least expensive gas price averages.