which 4-door car is currently the most affordable in germany in terms of price and l/100 km

GPT-5.4 (changed mind)

Answer: I would revise my answer to: the Dacia Sandero SCe 65 is the strongest current answer for the most affordable car in Germany when balancing low purchase price with low l/100 km, assuming "4-door car" includes common 5-door hatchbacks.

I changed my position because the other answers surfaced a more defensible interpretation of the question's two metrics together: purchase price and official fuel consumption in l/100 km. My earlier choice, the Dacia Sandero Essential ECO-G 100, is very persuasive on real-world running cost because LPG is cheaper per liter, but it is weaker if the question is read literally as asking for affordability specifically in terms of sticker price and l/100 km rather than fuel-price-adjusted cost per 100 km. Claude Opus 4.7 and Gemini 3.1 Pro both made the key point clearly: the Dacia Sandero SCe 65 sits at the very bottom of the German new-car market on purchase price, while still posting acceptable combined consumption around the low-5 l/100 km range. That makes it easier to defend than the LPG variant under the exact wording, because LPG helps cost per 100 km more than it helps the raw l/100 km figure. I am not persuaded by the Dacia Logan answer. In the current German market, the Logan is much less clearly available and competitive as a new-car baseline than the Sandero, and the quoted starting-price range is already high enough to undermine the claim that it is the affordability leader. So the best revised answer is the Dacia Sandero SCe 65, with an important caveat: this depends on treating a 5-door hatchback as a practical "4-door car" in ordinary market usage. If the user instead means a strict sedan with exactly four side doors and wants a currently sold new model in Germany, the answer could change and the field becomes much narrower. There is still ambiguity. If the user means lowest total ownership cost, my earlier LPG-based Sandero argument remains strong. If the user means lowest l/100 km regardless of purchase price, a small hybrid could win. But for the combined plain-language reading of low price plus low l/100 km, the Sandero SCe 65 is the more precise answer.

Grok 4.20 (changed mind)

Answer: The Dacia Sandero SCe 65 is currently the most affordable 4-door car in Germany when balancing purchase price and fuel consumption in l/100 km.

Upon reviewing the responses from GPT-5.4, Claude Opus 4.7, and Gemini 3.1 Pro, I have updated my position from the Dacia Logan. The key insight that convinced me is that true 4-door sedans like the Logan are no longer sold new in the German market, making the Sandero the relevant budget champion among currently available vehicles. The Sandero Essential SCe 65 starts at approximately €11,300–€11,900 with WLTP fuel consumption of 5.1–5.4 l/100 km. This delivers a better combination of low sticker price and reasonable efficiency than alternatives like the Mitsubishi Space Star, whose slightly lower consumption does not offset its higher entry price. While the ECO-G LPG variant offers even lower running costs, the pure petrol SCe 65 best matches the question's focus on l/100 km alongside purchase price. Real-world factors such as promotions can shift the picture, so consulting current German configurators or ADAC data remains advisable.

Claude Opus 4.7 (changed mind)

Answer: The Dacia Sandero is currently the most affordable 4-door car in Germany, with the SCe 65 winning on lowest sticker price and the ECO-G 100 LPG variant winning on lowest fuel cost per 100 km.

After reviewing the other responses, I'm largely maintaining my position that the Dacia Sandero is the answer, but I want to refine it by explicitly acknowledging the LPG variant that GPT-5.4 highlighted. Gemini 3.1 Pro essentially agrees with my original pick (Sandero SCe 65 at ~€11,300, ~5.3 l/100 km) and makes the same correct point that its price advantage over the Mitsubishi Space Star outweighs the Space Star's marginal fuel-economy edge. Grok 4.20's answer pointing to the Dacia Logan is weaker in the German context, because the Logan sedan is not officially sold new in Germany anymore — only the Sandero, Sandero Stepway, Jogger, Duster, and Spring are in the current German Dacia lineup. So Grok's premise is factually shaky for the German market. GPT-5.4 raises a genuinely strong point I under-weighted: if the question literally says "price AND l/100 km," the Sandero ECO-G 100 (bivalent petrol/LPG) arguably wins the combined metric better than the SCe 65, because LPG consumption (~7–8 l/100 km LPG) costs far less per kilometer than the SCe 65's petrol consumption, while the purchase price is only marginally higher (~€12,400). I mentioned this in my original answer as a footnote, but GPT-5.4 is right to elevate it. So my refined position: the Sandero family is clearly the winner, with the specific variant depending on interpretation — SCe 65 for lowest purchase price, ECO-G 100 for lowest combined cost of ownership. I'm crediting GPT-5.4 for sharpening the ECO-G angle.

Gemini 3.1 Pro

Answer: I maintain that the Dacia Sandero SCe 65 is the most affordable 4-door car in Germany when strictly balancing the lowest upfront purchase price with optimal l/100 km fuel efficiency.

Reviewing the other models' responses, [GPT-5.4] makes a compelling real-world point about the Dacia Sandero ECO-G 100 being cheaper to operate overall due to low LPG prices. However, the prompt specifically evaluates affordability in terms of "price and l/100 km." LPG engines inherently consume more liters of fuel per distance (typically around 6.5 l/100 km) than their petrol counterparts. This means the ECO-G actually performs worse on the strict "l/100 km" metric compared to the SCe 65 (5.3 l/100 km). Furthermore, while [Grok 4.20] correctly identifies the Dacia Logan as a traditional 4-door sedan, it fails to note that the Logan sedan is no longer officially sold as a new car in Dacia's German market lineup. Recommending a discontinued or gray-market import is impractical for a buyer looking for current market affordability. Therefore, assuming the standard colloquial use of "4-door" to include 5-door hatchbacks (which have four passenger doors), the Dacia Sandero SCe 65 remains the undisputed champion. While the Mitsubishi Space Star edges it out slightly on pure fuel efficiency (4.9 l/100 km), the Sandero's significantly lower base price of around €11,300 makes it the best combined financial choice.

Final Summary

The AI Roundtable reached a consensus that the Dacia Sandero SCe 65 is the undisputed champion of affordability in the German market. Gemini 3.1 Pro and GPT-5.4 emphasized that its low starting price (~€11,300) and 5.3 l/100 km consumption create the best financial balance, even if rivals like the Mitsubishi Space Star are slightly more fuel-efficient. Grok 4.20 originally suggested the Dacia Logan but revised its position after Claude Opus 4.7 pointed out that the Logan sedan is no longer sold new in Germany.

All 4 models agreed