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

GPT-5.4

Answer: There is no single current 4-door car I can confidently name as the most affordable on both purchase price and L/100 km without a market, region, and whether you mean new or used, because the answer varies significantly by country and model availability.

The question combines two different affordability dimensions: upfront price and fuel consumption. Those often point to different winners. The cheapest 4-door car by sticker price is not always the one with the best L/100 km, and the most fuel-efficient model may cost substantially more to buy. It also depends heavily on location. Vehicle lineups, taxes, incentives, trim availability, and fuel-economy testing standards differ across countries. A model that is the cheapest in one market may not even be sold in another. Likewise, published consumption may be listed under WLTP, EPA, or other standards, which are not directly interchangeable. The term “4-door car” is also ambiguous. Some people mean only sedans; others include hatchbacks with four passenger doors, liftbacks, and compact cars. That definition can materially change the answer. If the goal is true affordability, the best comparison is total cost of ownership: purchase price, fuel use, insurance, maintenance, taxes, and expected depreciation. In many markets, a small non-hybrid sedan or hatchback offers the lowest purchase price, while a hybrid offers lower L/100 km but a higher upfront cost. The cheapest overall option depends on how many kilometers you drive per year. So the most accurate answer is that there is no universal single winner from the information given. If you specify your country, whether you want new or used, and whether “most affordable” means lowest purchase price, lowest fuel cost, or best combined total cost, I could identify the likely top model or shortlist.

Claude Opus 4.7

Answer: The Mitsubishi Mirage G4 sedan is currently the most affordable 4-door car when combining purchase price and fuel consumption (L/100 km).

When you balance sticker price against fuel economy on a L/100 km basis, the Mitsubishi Mirage G4 sedan stands out. It has an MSRP starting around US$17,000–18,000 (CAD ~$19,000), making it one of the cheapest new 4-door cars sold in North America, and it returns roughly 5.6–6.0 L/100 km combined with its 1.2L 3-cylinder engine and CVT — among the best figures for any non-hybrid gasoline car. Competitors to consider: the Nissan Versa sedan is slightly cheaper in the U.S. (~US$16,000) but consumes a bit more fuel (~6.7 L/100 km combined). The Kia Rio sedan has been discontinued for 2024. Hybrids like the Toyota Corolla Hybrid or Hyundai Elantra Hybrid achieve far better economy (~4.5 L/100 km) but cost significantly more (US$23,000+), so on a combined affordability + efficiency metric they don't beat the Mirage G4 unless fuel costs are weighted heavily over ownership. Important caveat: Mitsubishi has announced the Mirage/Mirage G4 will be discontinued after the 2024 model year, so availability is shrinking. Also, 'most affordable' depends on market — in Europe or Asia, models like the Dacia Logan or various Suzuki/Maruti sedans would win. If you can share your country, I can give a more precise answer.

Gemini 3.1 Pro

Answer: The Mitsubishi Mirage is widely considered the most affordable 4-door car currently available when factoring in both its exceptionally low starting price and its highly efficient fuel consumption of roughly 6.0 L/100 km.

When balancing the lowest possible upfront purchase price with ongoing fuel savings, the Mitsubishi Mirage (available as a 4-door sedan or 5-door hatchback) stands out as the ultimate budget vehicle in the North American market. It boasts a starting MSRP of around $16,000 to $17,000 USD and delivers an outstanding combined fuel efficiency of approximately 6.0 to 6.2 L/100 km. While hybrid vehicles like the Toyota Prius or Hyundai Elantra Hybrid achieve significantly better fuel economy (often dipping below 4.5 L/100 km), their starting prices are considerably higher—usually well over $25,000 USD. This higher initial cost negates the fuel savings for many years, making a traditional, ultra-lightweight internal combustion engine car like the Mirage the true winner for sheer immediate affordability. It is worth noting that the 'most affordable' car depends heavily on your local market. If you are in Europe, the Dacia Sandero takes this crown, offering a remarkably low purchase price alongside excellent fuel efficiency. In Asian markets, options like the Suzuki Celerio or Maruti Alto provide unmatched budget-friendly pricing and exceptionally low L/100 km ratings. However, on a global scale of widely available commuter cars, the Mitsubishi Mirage remains the gold standard for the cheapest cost of entry combined with the lowest gas station bills.

DeepSeek V3.2

Answer: Currently, the Dacia Logan is often considered the most affordable 4-door car in terms of both purchase price and fuel consumption.

The Dacia Logan, particularly in its base configuration, consistently ranks among the lowest-priced new cars in markets where it is sold, such as Europe and parts of Africa. Its starting price is typically under €10,000, making it exceptionally accessible. In terms of fuel efficiency, the Logan's most economical engines achieve around 5.2 to 5.6 liters per 100 km (approximately 45–54 mpg) for petrol versions, and even lower for diesel variants, which aligns with its focus on low running costs. While affordability can vary by region and currency, the Logan's design philosophy prioritizes minimalism and cost-effectiveness without sacrificing essential features, resulting in a compelling balance of low upfront cost and economical fuel usage. Other models like the Mitsubishi Mirage or Suzuki Dzire may compete closely in specific markets, but the Logan's widespread reputation for value and efficiency gives it a strong claim to the title.

Final Summary

The AI Roundtable highlighted the Mitsubishi Mirage and Dacia Logan as the current dual champions of budget motoring. Claude Opus 4.7 and Gemini 3.1 Pro focused on the Mirage's sub-$18,000 price point and 6.0 L/100 km efficiency in North America, while DeepSeek V3.2 championed the Dacia Logan as the European value king. GPT-5.4 served as the lone dissenter, noting that local taxes and regional availability make a single universal answer impossible.

3 of 4 models identified specific leaders