Just a day after Nissan brought us news of several of exciting electric car concepts it's planning to unveil at the upcoming 2011 Tokyo Motor Show, rival Japanese automaker Suzuki has come out today with the first details on its own electric concepts as well as the oddly named Regina.

The Regina, which is essentially a lightweight city car, features a conventional gasoline engine and seating for four, yet it weighs in at just 1,609 pounds.

This low weight, combined with a coefficient of drag that’s 10 percent lower than similar sized city cars, results in an average gas mileage of 72.3 mpg.

Overall dimensions for the Regina are a length of 11.6 feet, width of 5.3 feet, and an overall height of just 4.7 feet. Its wheelbase measures in at just less than 8 feet in length. Inside, there’s a minimalist cabin with touch-screen panels and a clear glass floating stack for the main center console.

2011 Suzuki Q Electric Car Concept

2011 Suzuki Q Electric Car Concept

Also on show in Tokyo will be the Suzuki Q Concept, a highly stylized electric cart designed for people whose daily routes aren’t likely to exceed more than 6 miles. Drive comes for an undisclosed electric power source and inside its cabin there is seating for only two.

Suzuki’s third concept is the one most likely destined for production. It is a range-extended electric version of the Suzuki Swift subcompact currently sold overseas. On a full charge of its lithium-ion battery, the Swift EV will be able to travel between 12 and 18 miles before a compact gasoline range-extender needs to fire up and start charging the batteries. You’ll note that this drivetrain concept is similar to the one in the Chevrolet Volt and Fisker Karma.

Press days for the 2011 Tokyo Motor Show don’t kick off until November 30, but in the meantime follow our ongoing coverage of the event by accessing our dedicated show page.

2011 Suzuki Swift Electric Car Concept

2011 Suzuki Swift Electric Car Concept