Cooking with tins?

I've moved away from always using dried beans and chickpeas and the like because I reckon it probably uses less energy for a factory to produce lots of tins than each home to boil their own. And the costs seem to be about the same.
My guilty secret used to be treacle sponge in a tin

You would have to include the energy that goes into mining/processing the ore and creating the tin, then recycling the empty tin.

Having said that, it isn't that easy to compare.
Tescos have 4 different cans of red kidney beans for example that seen to be roughly the same analysis at 30p (Aldi equiv.) 55p own label 79p organic and 85p branded.
240g drained weight 268cal per tin. The organic ones were less calories.

2 dried beans, both branded:
500g  266cal /100g£1.40
2kg   337cal/100g  £4

So avrg of the 2 dried beans is about 90g for 268cal.

which costs 25p or 18p depending on the pack size - no Aldi equiv. price for dried beans.

Then of course energy you use at home would depend how cooked. A pressure cooker is far quicker and cheaper than in an ordinary pan.