Will you show your working? I'd be very curious to see it
For the record, I bought a longer 10m cable when I got my new car to replace the old 5m cable. It cost me 120 quid back then, but I see they can be picked up for 60 quid now. This is for a 7kW capable cable.
In the UK today, petrol is about 130p per litre, so 120 quid's worth is 92 litres. A UK spec Mercedes GLA (the equivalent of my car, an EQA) gets about 42mpg. That's 9.2 miles per litre, so enough for 850 miles. The typical UK car is driven 20 miles per day, so that's enough petrol for maybe six weeks at a push. Hence why I'm curious about your working. From what I can see, Canadian gas is about 134 cents per litre today, and I'd be amazed if you drove as little as 20 miles per day or got as much as 42mpg, so I can't see how this works for you. Looks like you can get a 10m cable for somewhere between 200 and 400 Canadian dollars, so that's also in line with UK pricing.