Sounds like you made a wise choice. Some of these guys on here from North Pole, Canada and places thousands of miles north of me, up near the Canadian border can advise you on undercoating. It's true your car is not new. But perhaps it's been undercoating in the past. But might be a good idea to do it / re-do it even at 8+ years old.
I suppose your car has the 1.0L? Is it a 5 speed or CVT?
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View my fuel log 2020 Mirage ES 1.2 manual: 42.4 mpg (US) ... 18.0 km/L ... 5.5 L/100 km ... 51.0 mpg (Imp)