Grey hound running buddy?

Hello all, I'm currently deciding if I want to adopt a retired racing grey hound right now. I live in an apartment with no yard so they seem like a great pick for me as I heard they are awesome apartment dogs. As part of the adoption application process I have had to do a lot of reading on the dogs and visit some at an open house. When I got there I was asking a ton of questions to the respective handlers specifically some about exercise. I'm a pretty active guy and one of the reasons I want a dog is for a running/jogging buddy. Like around 3-6 miles at around 6-8 minute paces. I know grey hounds are sprinters. The people there said that they don't do good at any kind of running besides sprinting. I might be able to work them up to 3 miles, but nothing past that. Was wondering if there are any runners here that count a grey hound as one of their running buddies so I could get their opinion. As much as I would love to adopt one I don't want to get one for the wrong reasons and want to set my expectations accordingly. Thanks.