The surge in gasoline prices appears to have stalled this week around $3.92 per gallon. But experts caution that more increases lie ahead.

Many refineries have yet to undergo a seasonal maintenance period that will force them to produce less gas. That will tighten supplies in parts of the country, especially in the Great Lakes region, forcing prices higher.

Patrick DeHaan, a retail price expert with GasBuddy.com, expects the national average to rise to between $3.95 and $4.35 per gallon by the end of April.

Meanwhile, oil prices are falling after a two-day rise. Benchmark U.S. crude gave up 80 cents to $104.43 per barrel in New York while Brent crude was down 9 cents $125.34 per barrel in London.