I've definitely tightened my belt in the last twelve months or so and recently, even more so. But there are some things that I won't substitute, so I'll give some examples.
Nescafe Gold - it's expensive, but sometimes on offer and on certain days - offer plus discount up to 15%. I can now make a 100g jar last just over two weeks.
Milk - I prefer La Serenisima 2%, whereas Adri will go for the cheapest of any brand.
Juice - Cepita Mulifruta with a dash of 7UP for days when I'm on the wagon (weekdays)
Doritos - almost a luxury now, so I think twice before buying.
Havana Rum - my weekly treat. I really have to shop around for this and grab bargains when I see them.
Golden Virginia tobacco green packet - often it simply disappears, like so many other products, but Tabaqueria Inglesa in Microcentro still has it. Smoking is now becoming very expensive at $5300 per 30g.
When out shopping last Friday for bbq food for four, I managed to find a small pack of mollejas for $2000 which was a result. I then bought a pack of three morcillas for four of us and then raided the freezer for the rest, including frozen bread rolls and a pack of eight chorizos that I had bought before Christmas for inflation reasons. In fact, I picked up one or two items in Carrefour and after a few minutes, put them back. I see a lot of people doing that nowadays,
The thing about asados is that we always cook too much, so this time there was hardly any wastage. Same for the picada - I just put some crackers and cheese slices on the table and everyone was happy. Bear in mind that this was a men only bbq and I may not have got away with such frugality if women had been involved.
As for fuel, I keep the bike tank full all the time (Shell is the most expensive in my experience).
We switch lights and fans off and only use the aircon when total nudity isn't an option, so to speak.
As for comparing prices, Adri is more astute than me and chooses all the right days/supermarkets/cards for the discounts. We both have Coto community card, Carrefour loyalty (plus over 60 discount), Disco/Jumbo card etc etc.
A young Argentine entrepreneur has come up with an app for comparing prices, called Ratoneando and you can read about it here, open in Chrome and right click for English translation.
I'll let you all know how effective the app is.
Gratis y a un clic: cómo funciona "Ratoneando”, una app para ahorrar en los supermercados | TN
In short, I now think twice before buying anything, which is totally out of character for me, but perhaps will teach me not to be so impulsive.