You can try it, but listen for detonation, which is most likely at low revs/high load. I run regular unleaded in my car with no signficant detonation, but I only drive it during the winter months, so the cooler inlet air temperatures help reduce detonation tendency. When I drove it year round it would sometimes detonate slightly on hot summer days in traffic with the AC, even though I used premium.

I've had to modify my driving habits a bit by not short shifting and loading the engine quickly. With an auto. trans, the torque converter reduces the amount you can load the engine at low revs relative to a manual trans.

Duke