Dihatsu came and went in the US market. They weren't bad little cars, just America wasn't ready for a little 3 cylinder sardine can at the time, and it didn't even get that great on gas.
There is a market for 3 cylinder sardine cans now.
We had a 3 cylinder 1.0 liter Chevy Sprint once, later became Geo Metro, Suzuki built. That little car got 60 mpg, honest, and ran the speed limit all day long. Awesome mileage and this is the right market for something like that again. I've always appreciated outstanding mileage, though. The car's chassis was tinny and it wasn't terribly comfy. Our Echo is fantastic on comfort and 40 to the gallon still ain't bad with a 1.6 liter. Got a lot more gittyup than that Sprint did, too, and it's an auto tranny.