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From Cochrane to Villa O'Higgins there's no fuel station for 244km. Leave Cochrane with a full tank — and in Puyuhuapi, further north, the pump sells diesel only.
Only Chaitén, Futaleufú, Coyhaique, Chile Chico, Cochrane and Villa Cerro Castillo have a cash machine. Many campsites and boat trips take cash only.
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Chilean ATMs typically charge foreign cards CLP 5,000–9,200 (≈ €4.5–8.3) per withdrawal and cap each one around CLP 200,000 (≈ €180), so plan withdrawals around the six machines.
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The boat trip from Puerto Río Tranquilo is about CLP 20,000 (≈ €18) for an hour and a half — one of Patagonia's cheapest headline sights. Kayaking, when the lake allows it, is about CLP 50,000 (≈ €45). Compare Marble Caves trips
And while you're counting: Queulat National Park, home of the hanging glacier, charges CLP 8,500 (≈ €8).
The Hornopirén crossing costs about CLP 34,300 (≈ €31) per car from March to December, against up to CLP 69,500 (≈ €63) in January and February.
Gravel means 60km/h at best. With no lighting and animals on the road, nobody sensible drives it at night — so plan days by daylight, not by distance.
The Carretera Austral stops at Villa O'Higgins. The way on to El Chaltén is a boat across Lago O'Higgins, about 21km on foot to the Argentine border post, and another boat across Lago del Desierto. No cars — only hikers and cyclists.
The Chilean networks are fine in each town along the road; the long stretches between them are dead. A small eSIM covers the towns — it won't buy you signal on the road itself, but it means you're never caught without data for longer than the drive takes.