The BS6 emission norms kicked in from April 1, 2020. As a result, many popular brands including Maruti and Skoda-Volkswagen converted their models to petrol-only offerings. On the opposite hand, brands like Tata, Hyundai and Mahindra have continued to supply both petrol and diesel engines to customers. we’ve compiled an inventory of the five most fuel-efficient diesel cars we tested in 2020. Our fuel efficiency testing was administered within the city also as on the highway. Take a look:
| Rank | Model | Our City Result | Our Highway Result |
| 1 | Hyundai i20 MT | 18.51kmpl | 23.35kmpl |
| 2 | Hyundai Creta MT | 16.03kmpl | 20.23kmpl |
| 3 | Honda City MT | 15.32kmpl | 20.68kmpl |
| 4 | BMW X1 D AT | 13.43kmpl | 21.71kmpl |
| 5 | Jeep Compass D AT | 11.21kmpl | 16.81kmpl |
Jeep Compass AT
ARAI Claimed Fuel Efficiency: 15.3kmpl
Tested City Fuel Efficiency: 11.21kmpl
Tested Highway Fuel Efficiency: 16.81kmpl
Average Of City And Highway Fuel Efficiency: 14.01kmpl
Price (Diesel AT variants): Rs 21.96 lakh to Rs 27.60 lakh
Jeep introduced the diesel-auto powertrain on the Compass in January 2020. The 2.0-litre diesel comes mated to a 9-speed converter unit along side a 4×4 drivetrain. This powertrain of the SUV delivers a mean fuel efficiency of 14.01kmpl. it’s earned the fifth rank in our books because the most frugal diesel car of 2020.
BMW X1 AT
ARAI Claimed Fuel Efficiency: 19.62kmpl
Tested City Fuel Efficiency: 13.43kmpl
Tested Highway Fuel Efficiency: 21.71kmpl
Average Of City And Highway Fuel Efficiency: 17.57kmpl
Price (Diesel variants): Rs 40.60 lakh to Rs 42.90 lakh
The BMW X1 is that the only luxury model here. it’s offered with a 2.0-litre turbocharged diesel , including an 8-speed AT gearbox. What’s surprising is that albeit it’s a luxury SUV, its mileage on the highway surpassed the claimed fuel efficiency figure of 19.62kmpl.
Honda City MT
ARAI Claimed Fuel Efficiency: 24.1kmpl
Tested City Fuel Efficiency: 15.32kmpl
Tested Highway Fuel Efficiency: 20.68kmpl
Average Of City And Highway Fuel Efficiency: 18kmpl
Price (Diesel Variants): Rs 12.39 lakh to Rs 14.64 lakh
Honda offers the fifth-gen City with a group of 1.5-litre petrol and diesel engines. While the previous comes with both manual (6-speed) and automatic (7-step CVT) transmission options, the diesel gets a 6-speed MT only. This powertrain combo has made the diesel-powered sedan one among the foremost frugal models we tested in 2020.
Hyundai Creta MT
ARAI Claimed Fuel Efficiency: 21.4kmpl
Tested City Fuel Efficiency: 16.03kmpl
Tested Highway Fuel Efficiency: 20.23kmpl
Average Of City And Highway Fuel Efficiency: 18.13kmpl
Price (Diesel-MT variants): Rs 9.99 lakh to Rs 15.90 lakh
The second-gen Hyundai Creta was launched in March 2020. It gets an equivalent engines as its cousin, the Kia Seltos, including the 1.5-litre diesel. This engine is obtainable with either a 6-speed MT or a 6-speed converter unit. The Creta, with the 1.5-litre diesel mated to the 6-speed MT, has an ARAI claimed fuel efficiency of 21.4kmpl and returned a mean mileage of 18.13kmpl in our tests.
Hyundai i20 MT
ARAI Claimed Fuel Efficiency: 25kmpl
Tested City Fuel Efficiency: 18.51kmpl
Tested Highway Fuel Efficiency: 23.35kmpl
Average Of City And Highway Fuel Efficiency: 20.93kmpl
Price (Diesel Variants): Rs 8.19 lakh to Rs 10.74 lakh
Taking the highest spot within the table, Hyundai’s third-gen i20 has the simplest claimed also as tested mileage figures among all diesel models we tested in 2020. it’s equipped with an equivalent engines because the Venue including the 1.5-litre diesel. Hyundai, however, is offering this engine with a 6-speed MT only.
The fuel efficiency of a car is majorly hooked in to the driving style, the health of the car and therefore the driving environment. Hence, these numbers could easily change if any of those factors are affected. If you own any of the cars from the above table, don’t forget to allow us to know the fuel efficiency you derive from your vehicle within the comments below.