Mark, try tightening your accessory drive belt. That squeal indicates a slipping alternator. An alternator is loaded trying to recharge the SLI battery after engine startup, especially during shorter days & longer nights where the headlamps are likely to be used more. This can explain the slippage. The load on the alternator declines as the battery charges back up. Explainable, but also easily fixable.
Originally Posted by Mark
Guess how I know this (not my Mirage, by the way.)
View my fuel log 2015 Mirage ES 1.2 manual: 49.7 mpg (US) ... 21.1 km/L ... 4.7 L/100 km ... 59.7 mpg (Imp)