I bought a used 2016 CT with 33k miles on it. The front tires are original OEM Michelin tires that are mostly worn with 4/32" left. The rear tires are new Ironman iMove Gen2 AS tires, which cost $65 each. OEM tire is $153 per tire. I feel I am not getting good MPG. Should I just replace all of the tires with OEM? I don't want the mixing of tires to increase chance of oversteer and understeer on wet roads.
On a related note, when I brake lightly, I can hear a little noise like metal scratching on initial contact. When I brake more, I don't hear that noise. I was told my front brake has 50% left. Is this brake noise due to the hybrid system?