Where I live is close to the bottom of a hill within a subdivision. I have found, through repeated testing, that if I a) shift my Toyota Prius into neutral at a specific speed once I turn into the subdivision and b) follow the same path, then I can overcome the two small hills and coast all the way down to the end of my driveway. It's kind of a geeky thing to know, but I'm an engineer with a cool car built to do stuff like that.
Last week I got new tires. A day later I took the normal coast route but the car felt different - a little slower while coasting. I had shifted into neutral within a couple mph, the roads were not slippery so I didn't need to brake excessively for the curves, but it was definitely slower. So I called the shop &, as I suspected, they need to be balanced better.
This is a perfect example of why you should run a Gage R&R on your test system every once in a while. Like my regular "coast to the house" test, a regular test against a known standard will show you if there is something a little "off balance" with your system.