Sounds like a fun trip.
I have seen some of the steep roads on the north shore of the Gaspe peninsula and I can imagine needing 2nd gear with a full car.
But I saw it from the water, not by car. I've sailed from the 1000 Islands to Nova Scotia and back a few times on the St Lawrence with stops in Gaspe, plus a few little villages along the way and in la Baie des Chaleurs. One of my crew-mates grew up in Carleton and had done a bicycle trip around the peninsula, and she told stories of the steep hills too.
Beautiful!
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View my fuel log 2015 Micra S manual: 5.0 L/100 km ... 56.5 mpg (Imp) ... 20.0 km/L ... 47.0 mpg (US) ...