I am not able to discern any deterioration in the suspension of my 2011 with 103,500 miles. We just arrived in North Carolina after a 12 hour sprint down yesterday and honestly the ride and handling is awesome. Total 740 mile drive at about 36 mpg on gas. This with a ferocious head wind for the first half of the trip. And I like the left lane and 78 mph. One phenomenon I have procrastinated on an oil change and leaving Michigan the oil life reading was 23%. Upon arrival in NC it reads 22%. It would seem age more than miles effects the reading. And yes I am due for fluid changes and we still have the original 12 V battery after 6 years, but the Volt is garaged year round in 55-68 degrees heated and earth sheltered space. My Volvo went 10 years and 130,000 on its original battery.