alt Hacker NewsThe Chevrolet Volt is a representative EREV. Its battery is 1/3 the size of a Model 3's -- that's a lot smaller than a pure BEV. 50 mile electric range, 45 mpg on gas. These cars are now 10 years old (approaching 15 for the first generation), and out of the 3 known common issues for Gen 2 only one has anything to do with the gasoline engine.
The Volt is not an EREV, it is a plug-in hybrid. GM wanted to make it a series hybrid (EREV) but due to the inefficiency at highway speeds it does engage the engine mechanically to drive the wheels.
(Interestingly, the wikipedia page for EREV incorrectly cites the Volt as an example of an EREV, but the actual page for the Volt correctly identifies it as a plug-in hybrid.)
As an unrelated aside, it also has been abandoned altogether by GM and the only way to fix the battery is to find a third-party repair shop to work on it. Batteries are not available, and for the cars remaining under warranty coverage a battery failure results in GM buying back the car since they cannot fix it. Caveat emptor; IMO the resale value right now is much too high given that risk.
Off the top of my head, the only example I can think of for an EREV that actually reached production status (in the US at least, China excepted) is the BMW i3.