Automatic 307 surprising performance

We made the Izmir-Fethiye route with five people in my vehicle and an average of 300kg in the trunk. The temperature was 36 degrees. The Fethiye-Faralya road is a mountainous one, with constant uphill climbs. They were criticizing these cars, but we made it through the challenging roads without any problems. What are your thoughts? Thanks.

Is your car diesel, sir?

1.6 gasoline