When I took a Mirage to the dealer to try and get the cvt replaced under warranty(after they told me it needed a throttle body cleaning and spark plugs) they claimed that Mitsubishi's head office wanted proof that there were transmission flushes completed at 50,000km/30,000miles... I don't know wtf they meant by that. Most cars last til warranty is over without dropping the pan or even changing filters. Some don't. This car has just over 100,000km/60,000 miles and was serviced by an independent shop. But the cvt fluid was never changed in any of the cars at that location. They do now though... I ended up replacing the cvt with a used one.
Depending on how you drive and how long you plan to keep the car would depend on how much care I'd give it. If you plan to get rid of it once warranty is up do the minimum. I'd have something in writing or email from the dealer explaining that you only need to do a drop and fill to keep warranty. Dealers are greasy. Not all but lots.
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View my fuel log 2014 Mirage SE wussie cvt edition. 1.2 automatic: 37.7 mpg (US) ... 16.0 km/L ... 6.2 L/100 km ... 45.3 mpg (Imp)