Most small cars weigh in at less than a ton, some well under.
Most vans are capable of towing at least 2 tons, even if they have been down rated by the converter they are still capable, they altered the chassis not the engine.
If your van can't tow 1 ton then it's knackered.
You shouldn't even notice a small car except in hill country but you're going to notice the hills without a car in tow anyway.
So the Fiat 500 has a Kerb weight: 865 to 1,000 kg. Behind our PVC Fiat 2.3 130 we tow a trailer with two Harleys on plus other stuff which has gross weight of 1025kgs. On the level and minor hills it's comfortable at 60mph in 6th, steeper rise it's 5th and still comfortable at 50 mph ish. Really steep, long hills needs 4th.
We recently took on a Fiat 500 with the A frame package. It tows well behind the truck and as mentioned on here..hardly noticeable. We have had an engine remap but seriously have not seen any difference with the towing side of things with the original 130 BHP to be honest.
If the Mito is similarly weighted..all should be fine.