One of the best is 'The Dark Knight Returns'. It presents an aged Batman coming out of retirement in a gritty, alternate future of the DC Multiverse. It's a story that challenges the traditional view of superheroes and their place in society.
The Batmobile's speed in the comics is quite impressive. It's often shown as being able to reach high velocities quickly and maneuver through challenging situations. However, the exact speed can change based on the creative direction of the specific comic issue or series.
As of now, the current Flash is usually considered to be Barry Allen. But the DC Comics universe is complex, and there could be alternate versions or storylines that feature other characters as the Flash temporarily.