B58 Gen3 6cyl (BMW M340i / M350) vs 2.0 TSI 4cyl: highway fuel consumption economy l/100 km mpg test

Here you have the real fuel consumption (fuel economy) of BMW M340i xDrive 392HP G20 2025/2026/2027 with newest B58 gen3 3.0l turbo-petrol (inline-6 straight-6) engine. Total system power: 288 kW (392 PS), 540 Nm, xDrive AWD, 8-speed Steptronic automatic gearbox. This is the third generation of the B58 engine. It is set to offer improved fuel efficiency. BMW M340i models produced in 2025 and 2026 also feature more fuel-efficient tyres. The same engine (in a slightly more powerful version - 326 kW, 443 HP) is set to be fitted to upcoming BMW M350 (G50), but remember: it will be slightly larger and heavier car. Efficiency user review made in a city (urban area, town), highway and autobahn, motorway, freeway, sub-urban, autovia, autovía. 00:00 Fuel consumption results for BMW M340i xDrive 00:22 Consumption in a traffic jam town city urban in eco pro mode Full video city consumption test including comfort mode with start-stop deactivated:    • BMW M340i 2026 (B58 Gen3): CITY fuel consu...   eco city: 7.5 l/100 km | 31.4 mpg US | 37.7 mpg UK 01:18 90 km/h (56 mph): 4.9 l/100 km | 48.0 mpg US | 57.6 mpg UK 01:26 120 km/h (75 mph): 6.4 l/100 km | 36.8 mpg US | 44.1 mpg UK 01:34 140 km/h (87 mph): 7.7 l/100 km | 30.5 mpg US | 36.7 mpg UK very fast driving: 8-20 l/100 km (29-12 / 35-14 mpg US/UK) 01:42 Comparison l/100 km 2026 2027 BMW M340i with B58 Gen2 and B58 Gen3 02:06 mpg comparison with 2025/2026 BMW M340ixDrive economy versus Audi RS3 Limousine (2.5l TFSI) Audi RS5 Sportback (2022) (2.9 TFSI) Audi S3 Limousine 2021 (2.0 TFSI) Volkswagen Golf R Black (2.0 TSI) Audi A5 TDI quattro MHEV Limo Mercedes C 300d Sedan Volkswagen Passat 2.0 TDI 4Motion Lexus ES 300h 02:30 Real range comparison [km] with other cars (my own results only). Calculated range on one fuel tank (59 l) est. range in a city: 710-785 km | 445-490 mi est. range at 90 km/h (56 mph): 1090-1200 km | 680-750 mi est. range at 120 km/h (75 mph): 830-920 km | 520-575 mi est. range at 140 km/h (87 mph): 690-765 km | 430-475 mi 02:54 Range comparison [miles] with other sport oriented cars (my own results only). 03:17 User results fuel consumption & fuel economy Tyres: Hankook Ventus Evo 225/45 R18 95Y + 255/40 R18 99Y with "A" index of rolling resistance. As always, I checked real fuel consumption on a petrol station. I noticed -1%: computer shows HIGHER by 1% fuel consumption comparing to what I refueled on a petrol/gas station. Additionally: the reported distance was overstated by ~2.5%. Procedure: I drive 33 km in both ways on a highway/motorway (16.5 in each direction). Energy consumption/economy in a city is measured in real-life traffic in Warsaw (Poland) in similar conditions: the same amount of heavy traffic, light traffic and quite similar average speed. If you have any question, just write in in the comment section :) -------------------------------------------- [PL] Spalanie w BMW M340i xDrive 392 KM turbo-benzyna napęd na wszystkie cztery koła, zasięg i zużycie paliwa (l/100 km), benzyny średnio. Realny test zasięgu i spalania w BMW M340i napęd xDrive benzynowy turbodoładowany. Miasto, korki w mieście, drogi międzymiastowe (90 km/h), autostrada (140 km/h), droga ekspresowa (120 km/h), na autostradzie, droga szybkiego ruchu. Tryb mieszany. Spalanie w benzynowym BMW M340i xDrive z silnikiem 3,0l turbobenzyna R6. Pomiar spalania i zużycia paliwa. [DE] Kraftstoffverbrauch des BMW M340i xDrive mit 392 PS, Turbobenziner und Allradantrieb: Reichweite und Kraftstoffverbrauch (l/100 km), durchschnittlicher Benzinverbrauch. Praxistest zu Reichweite und Kraftstoffverbrauch im BMW M340i xDrive mit einem B58 Gen3-Turbobenzinmotor (vergleichbar mit dem BMW M350 xDrive G50). Stadtverkehr, Stau in der Stadt, Überlandstrecken (90 km/h), Autobahn (140 km/h), Schnellstraße (120 km/h), auf mehrspurigen, schnell befahrbaren Straßen. Gemischte Fahrweise. Kraftstoffverbrauch des benzinbetriebenen BMW M340i xDrive mit einem 3,0-Liter-R6-Turbomotor (Reihen-6, Straight-6). Messung des Kraftstoffverbrauchs und der Kraftstoffentnahme an der Tankstelle. [FR] Consommation de carburant de la BMW M340i xDrive à moteur essence turbocompressé de 392 HP et transmission intégrale : autonomie et consommation de carburant (l/100 km), consommation moyenne d'essence. Test d'autonomie et de consommation en conditions réelles sur la BMW M340i xDrive équipée d'un moteur essence turbocompressé B58 Gen3 (similaire à celui de la BMW M350 xDrive G50). Conduite en ville, embouteillages urbains, routes interurbaines (90 km/h), autoroute (140 km/h), voie rapide (120 km/h), sur une route à plusieurs voies à grande vitesse. Conduite mixte. Consommation de carburant de la BMW M340i xDrive à essence équipée d’un moteur R6 turbocompressé de 3,0 litres (6 cylindres en ligne). Mesure de la consommation de carburant et du plein à la station-service.