Gas was priced below $1/L at some Ottawa gas stations Tuesday and into Wednesday morning. (CBC)

Ottawa drivers lined up to fill up at some gasoline stations Tuesday and Wednesday as fuel prices sank below $1 a litre for the first time in six months.

On Wednesday morning at a small station on Montreal Road, gas was 98.7 cents a litre — about 30 cents lower than it had been at some stations this summer — and Rosemarie Dicaire was pumping it into her SUV to take advantage.

"Yeah, it's good," she said. "But hopefully it's going to go down again."

At another pump, Isabelle Broussell wasn't optimistic.

"I don't understand it why, all of a sudden, it goes down," she said. "But I might as well gas [up] because I don't think it will stay that way."

It was the first time since April that drivers had seen price signs without a "1" on the left-hand side.

Price moves higher

But at the Montreal Road station, it didn't last. Hussin Amin, the station operator, put the price up to 101.5 cents per litre just after 7:30 a.m.

He said the gasoline company called him and told him to make the adjustment first thing this morning.

"But it got so busy I had no time to change the price," he said.

A day earlier at another Ottawa gas station, those who managed to fill their tanks with cheaper gas celebrated, although some noted that they wouldn't have cheered 99-cent gas a couple of years ago.

A number of drivers said they planned to take advantage of lower gasoline prices by making longer car and trailer trips in the next little while.

Light sweet crude oil for November delivery was down $1.22 to $88.84 US a barrel in electronic trading on the New York Mercantile Exchange by midday Wednesday in Europe.

With files from Associated Press