So, with a state inspection looming close, we finally bit the bullet and had all 4 tires on our 2013 Volt replaced
After 40,000 miles, the OEM tires still had deep treads left in the main section but the edges had more or less worn off, I believe, partly because of my aggressive driving style and partly because of the weak sidewalls. The edges wore off disproportionately in spite of regularly rotating the tires, maintaining 42PSI (cold) and getting at least one wheel alignment (which was probably not required because the wheels were mostly to spec).
We decided to go with Michelin Premier A/S 215/55R17 94V tires, from COSTCO. After discounts and cash back, final price came to about $670 for all 4 tires, installed. COSTCO has some nice perks like nitrogen fill ( I will take it if it is free, even if the advantages are debatable), life time wheel rotation/balancing/patching, road hazard coverage, better warranty, etc
After the tires were replaced, the car felt a whole lot more taut, especially around corners. Handling was very firm and road noise was significantly reduced. My AER came down by about 10%, but part of it could be because temperatures soared to mid 90s, and I never skimp on AC (comfort mode, for the most part). I expect AER to recover partially (if not completely) as the tires get "broken in" and temperatures get back to normal. I pumped the new tires to 42PSI (cold). I will probably take it for another alignment, just in case. Sears owes me a free alignment anyway.
Will post an update in a month or two.
After 40,000 miles, the OEM tires still had deep treads left in the main section but the edges had more or less worn off, I believe, partly because of my aggressive driving style and partly because of the weak sidewalls. The edges wore off disproportionately in spite of regularly rotating the tires, maintaining 42PSI (cold) and getting at least one wheel alignment (which was probably not required because the wheels were mostly to spec).
We decided to go with Michelin Premier A/S 215/55R17 94V tires, from COSTCO. After discounts and cash back, final price came to about $670 for all 4 tires, installed. COSTCO has some nice perks like nitrogen fill ( I will take it if it is free, even if the advantages are debatable), life time wheel rotation/balancing/patching, road hazard coverage, better warranty, etc
After the tires were replaced, the car felt a whole lot more taut, especially around corners. Handling was very firm and road noise was significantly reduced. My AER came down by about 10%, but part of it could be because temperatures soared to mid 90s, and I never skimp on AC (comfort mode, for the most part). I expect AER to recover partially (if not completely) as the tires get "broken in" and temperatures get back to normal. I pumped the new tires to 42PSI (cold). I will probably take it for another alignment, just in case. Sears owes me a free alignment anyway.
Will post an update in a month or two.