1) What tires would provide the smoothest ride (mostly city driving in Dallas)? 2) "Service engine soon " light on left dash is on, yet is isn't time for service. Don't notice any driving problems. Any idea on the cause or urgency of this? Fuel cap tight. 3) AC blower has decided it has a mind of its own regardless of the setting on the dash controls. Is this a known problem and can it easily be repaired? Thanks for any helpful thoughts.