By Christina Rogers And Michael Calia 

Fueled by low gasoline prices and easier credit, the U.S. auto industry pulled its recent winning streak into 2015 with a projected 15% monthly increase compared with the same period a year ago.

January's volume suggests annual auto sales are tracking well above the pace set last year. General Motors Co., Ford Motor Co. and Fiat Chrysler Automobiles NV all notched year-over-year increases in excess of 13%, and major Japanese auto makers had similar gains in what is typically a slower month for sales.

"Consumers feel good because more people are working, the U.S. economy is expanding and fuel prices are low, GM Sales Chief Kurt McNeil said. GM, which reports earnings for its fourth quarter on Wednesday, is riding the strong American car market to strong earnings momentum, helping offset weakness abroad.

While January was hot, it was a bit weaker than the headline numbers suggest due to one more selling day in 2015 than 2014. And, the comparison to January 2014 was further aided by the storms and cold spell that crippled large parts of the nation a year ago.

Overall results of U.S. auto sales for the month are still being tallied and expected to be available later on Tuesday. The annualized pace of sales is projected to have increased 8.4% during the month, according to analysts at Morgan Stanley. If that rate holds through the year, U.S. auto sales will exceed 17 million for the first time in more than a decade.

The fundamentals of the industry remain strong, analysts and auto executives said. Auto makers, helped by plant closures and restructuring during the recession, are now in a far stronger position to manage fluctuations in production demands.

Factory utilization, for instance, is at an all-time high, according to data provider WardsAuto.com. This helps make factories more profitable, and unsold-car inventories remain in check, reducing the temptation to flood the market with vehicles no one wants to buy and lessening the need for large-scale discounts.

Automotive information provider Kelley Blue Book said transaction prices of new light vehicles are up 5% compared with a year ago to $33,993, although they fell 1.7% from December. TrueCar estimates average incentive spending, including rebates and discounts, was $2,642 during the month. That is a decline of 10.4% compared with December's numbers, but up 3.6% over January 2014.

Auto makers aren't the only companies cashing in. On Tuesday, AutoNation Inc., the nation's largest auto retail chain, posted record earnings of $1.02 a share in the fourth-quarter, beating analysts' expectations by 11 cents.

Gas prices, sitting at about $2 gallon, are helping juice demand for trucks and SUVs that consume more fuel but also deliver higher margins. Some buyers are using savings from lower fuel costs to purchase pricier options or come into the market sooner than otherwise planned.

"Low fuel prices provide a significant boost to consumer disposable income," Ford economist Emily Kolinski Morris said. She noted low interest rates are also helping, and "are likely to remain a prominent feature of the near-term outlook."

January's results reinforce the view that the domestic auto industry is among the healthiest industrial pockets in the world. GM, the market leader, reported a January increase of 18% and is riding a tailwind provided from the recent redesign of its full-size trucks and SUVs, including the Cadillac Escalade and Chevrolet Silverado.

Ford said it posted its best January retail sales since 2004, a 13% increase from the year-ago period. Sales of the company's F-series pickup truck grew about 17% during the month as it continued to ramp up supplies of the redesigned truck.

Toyota Motor Corp., the third largest U.S. seller after GM and Ford, said sales of its three brands rose 16% to 169,194 vehicles. It said its light trucks, which include SUVs, rose 18.5% over a year earlier.

Nissan Motor Co. recently launched new crossovers and SUVs that has helped it overtake Honda Motor Co. for fifth place in the sales pecking order, edging its Japanese rival out by sales of less than 2,000 vehicles last month. Its total sales were up 15% to 104,107 vehicles.

Hyundai Motor Co. said its U.S. sales were up 1% over a year ago to 44,505 vehicles.

Fiat Chrysler, which along with GM was bailed out by taxpayers in 2009, has been the fastest-growing car maker in America due to demand for its Jeep SUVs and Ram pickup trucks. Its sales were up 14% to 145,007 last month.

Jeff Bennett contributed to this article.

Write to Michael Calia at michael.calia@wsj.com

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