I said most of them are not suited for Japanese roads. Have you ever been to Japan and tried to drive on Japanese roads, many of which are barely 1 1/2 lanes wide? The average car in the US would be large in Japan. And the big cars are really road hogs here. I was behind a Lincoln Navigator the other day, and that thing was taking up nearly the whole lane, from shoulder line to center line. Perhaps you should educate yourself about the situation in Japan. Let me help:
There are more than 60 million registered vehicles in Japan, or about one vehicle for every two people. The car market is saturated.
There are more than half a dozen domestic auto manufacturers in Japan that are already competing for shares in a saturated market.
Japanese cars are generally reliable, and most owners in Japan trade their vehicles in before they even reach 50,000 miles. That means that there is a used car market as well full of low-mileage vehicles that are also in good running condition (Japanese used car dealers do not sell lemons as a general rule, and used cars even come with warranties). And given the rigorous inspection system here in Japan, there are very, very few actual "klunkers" on the road.
If you need a part for a domestic make, you can get it just about anywhere. If you need a part for a foreign make, you often have to go to a dealer, or even have it special-ordered. And if your foreign car has a breakdown out in the middle of nowhere, good luck in finding someone who can service it.
Your 4-banger Cobalt, which is described as a "sub-compact", would be considered standard size in Japan。Since it has a 2-liter engine, the yearly tax on it would be from $500+, depending on its age. The manufacturer's suggested retail price, stripped down, is $23,000, which is more expensive than a comparable Japanese car. It also weighs nearly 3000 pounds, meaning that the weight tax would also be high (about $200). Plus, it's a two-door, which is not a popular style in Japan.
Here is a Japanese car tax chart for comparison.
http://www.eris.ais.ne.jp/~t-kondo/kog/kcost.htmlYour Cobalt's class would be 2.0-2.5L (just below the top pink line), with standard gas mileage of 8 kilometers per liter. The taxes and other costs (in yen) from left to right are engine displacement tax; weight tax; mandatory liability insurance fee; optional insurance fee (collision for your vehicle and other people's vehicles; bodily injury to yourself and/or your passengers, etc.); fuel costs; turnpike tolls (average for 1 year; all expressways in Japan are toll roads); inspection fee (once every 2 years); and the two columns to the far right are average operating cost for 1 year, and average operating cost for 3 years. To convert yen into dollars, divide the yen price by 90.
The chart below that shows that it would be, on average, 2.2X as expensive to operate your Cobalt in Japan than it would be to operate a Japanese "Kei" car.