Which model is the most economical?

Hello together, I might want to buy a RAV4. Gen.4 Now I’m not sure whether diesel or petrol. Whether automatic or manual. The most important is the economy. When it comes to consumption it’s clear the diesel, but there’s more. Service and repairs. Which engine is more reliable, has generally less repair costs. Are the service costs different? Does the automatic machine have other disadvantages that can turn into costs besides additional consumption? In short: Which version Is in the long term the cheapest and most reliable? I live in the countryside, ride 5-10tkm annually. Rare under 10km, mostly about 25km per route. Important! Insurance and tax please do not consider other countries other tax models! Greeting motoquero