What are the best deals on hybrid, electric, and other fuel-efficient cars?

The President's Day holiday brings some serious deals on many fuel-efficient vehicles.

The U.S. Presidents' Day holiday typically brings sales on all sorts of things, including cars.

And carmakers have a whole new round of incentives for February, including some designed to get consumers into showrooms over the three-day holiday weekend.

That includes quite a few discounts on hybrids and plug-in electric cars, and we've gathered the best of them here.

We also have sections for diesel and fuel-efficient gasoline cars, should those interest you.

Hybrids

If you're willing to settle for older models, these two hybrid deals are worth considering.

The previous-generation 2015 Kia Optima Hybrid is available to lease at $200 per month for 24 months, with $1,499 due at signing.

This offer--which includes an allowance of 12,000 miles per year--expires at the end of the month.

The 2016 Optima Hybrid is a carryover model that's essentially unchanged from the 2015 version, even as non-hybrid 2016 Optimas launch with an entirely new architecture underneath--though you have to look extremely closely to tell.

This year's Optima Hybrid began shipping last November, but there are apparently still quite a few of the 2015 models left on dealer lots.

A redesigned 2017 Optima Hybrid is built on the new version--along with a first-ever plug-in hybrid model--was unveiled this week at the 2016 Chicago Auto Show, but it won't be available until later this year.

Buyers willing to settle for an outgoing design might also want to consider a leftover 2015 Toyota Prius instead of the new fourth-generation 2016 model.

The 2015 Prius may be an old design, but it's $70 cheaper per month to lease than the new model when effective costs are factored in, according to CarsDirect.

Toyota is offering $3,000 cash back on its dwindling supply of 2015 Prius hatchbacks through the end of the month.

Meanwhile, Toyota's initial 2016 Prius lease offer is $279 a month for 36 months, with $1,999 due at signing.

Plug-In Hybrids

The 2016 Hyundai Sonata Plug-In Hybrid hasn't been on sale long, but Hyundai is already offering significant discounts.

This month, buyers coming from competing brands can get a $1,000 "conquest bonus," which can be combined with a $2,000 rebate.

Through the end of February, the Sonata Plug-In Hybrid can be leased for $289 a month for 36 months.

That's with $2,199 down and an allowance of 12,000 miles per year.

Electric Cars

General Motors continues to offer generous incentives on the 2016 Chevrolet Volt, although the car won't be available nationwide until the 2017 model arrives this spring.

Buyers coming from non-GM brands can get a $1,000 conquest bonus on the Volt--but only through Monday, February 15.

While it lasts, that bonus allows "conquest" customers to get a Volt with no money down, and can also be combined with a separate, $1,000 bonus.

Chevy's current best Volt lease offer is $299 per month for 39 months, with 15,000 miles per year.

While not completely redesigned like the Volt, the Nissan Leaf does enter the 2016 model year with a new, 30-kilowatt-hour battery pack option that boosts range to 107 miles.

As it did last month, Nissan is offering zero-percent APR financing for 72 months on Leaf--although it's not advertising this.

There's also a $4,000 finance bonus, up from $500 last month.

Diesel Cars

The ongoing Volkswagen emissions scandal has thinned the ranks of diesel cars in U.S. showrooms considerably.

The 2016 BMW X5 SUV is one of the models remaining on sale, and it gets discounted this month.

Until February 29, BMW doubled the available cash back from $1,500 to $3,000, and is offering 2.92-percent APR financing for 72 months.

Leasing is somewhat less attractive, at $599 per month for 36 months, with $5,024 due at signing.

Fuel-Efficient Gasoline Cars

The 2016 Honda Fit is selling fairly well, so it's unusual to see it get a special finance offer, which may indicate that it's being hurt by the similarly-sized new HR-V crossover utility.

Honda is offering 1.9-percent APR financing on the subcompact hatchback--albeit only through Monday, February 15.

The offer carries over from January, although the term is now 60 months instead of the previous 72 months.

Although it's set to be re-badged as a Toyota this August, the 2016 Scion iA represents a pretty good value.

Through April 4, Scion is offering its only four-door sedan with zero-percent APR financing for 60 months.

Since the iA will still be sold as a Toyota after Scion dies, buying one now doesn't bring the typical risks of purchasing a car from a soon-to-be-defunct brand.

This article first appeared at Green Car Reports.