The Toyota D4D engine is renowned for its excellent fuel efficiency, striking a balance between economy and performance compared to other diesel engines in Toyota’s lineup[1]. This is achieved through advanced features such as common rail direct injection and turbocharging, which allow the engine to maximize both power and fuel savings[1].
Typical real-world fuel consumption for the popular 3.0-liter D4D engine in vehicles like the Toyota Hilux or Land Cruiser 120 averages between 8–9 liters per 100 km on highways at speeds not exceeding 120 km/h[7]. This equates to roughly 11–13.4 km per liter in mixed driving conditions, with users consistently reporting higher efficiency in urban settings and slightly higher consumption on open roads due to wind resistance at increased speeds[5][7]. For example, a user reported achieving about 13.4 km/l in town and around 11 km/l on highways[5].
The D4D’s fuel injection technology, specifically the common rail system operating at ultra-high pressures (up to 1,350 bar), ensures an 11% reduction in fuel consumption compared to its predecessor, the 1KZ engine, while providing 17% more power[3][6]. Additional efficiency is attributed to features such as pilot injection, which helps achieve more complete combustion and smoother, quieter engine operation[3][4].
Vehicle modifications, additional accessories, and carrying extra weight can increase actual fuel consumption beyond these baseline figures[7]. Moreover, fuel economy might differ across various Toyota models using the D4D engine, but the D4D consistently stands out for its balanced approach to economy and reliability in both commercial and personal use vehicles[1].
References
- [1] D4D Engine vs. Other Diesel Engines: Which One Comes Out on Top?
- [3] Toyota KD engine – Wikipedia
- [4] Toyota Hilux d4d Engine PDF
- [5] D4D Fuel consumption lower at high speed – Toyota Hilux 4×4 Forum
- [6] TOP and D4-D Engine of Toyota Hilux Vigo …
- [7] Fuel Consumption in a Fully Loaded Land Cruiser 120 D4D