Pushing the chairs together they should fully fit under the table.

Could someone please describe the color of the legs and top-how do you describe rustic gray. I have a gray trex deck where the table will sit-not trying to match but love the idea of a driftwood gray

The legs on the chairs and table are powder coated black aluminum frame and the eco-wood table top is best described as medium gray.

That doesn't tell me the color of the legs nor does it describe the color of the tabletop. Could yo be more specific on the COLOR of tabletop (light gray, medium gray, dark gray) and legs-powder coated aluminum- black, brown, dark gray?

We live in Washington DC with very cold winters and very hot summers. Can this be left out year round and what is the warranty?

Is there a particular cover you recommend?

For this dining set we recommend at least a medium size furniture cover.

can two chairs on each side be pushed under the table?

Pushing the chairs together they should fully fit under the table. Chairs are also stable for easy storage.