Tata Tigor CNG: fuel economy test, power figures

We find out if the Tigor CNG can deliver the ARAI-required fuel economy of 26.49km / kg.

After the introduction of an all-electric version, in addition to petrol, Tata Motors has extended the Tigor‘s variant range with the launch of the Tigor iCNG, As the name already suggests, this new version can use gasoline as compressed natural gas (CNG) to power its 1.2-liter three-cylinder engine – which has not been changed. While running on petrol, it produces 86hp and 113Nm of torque, while in CNG mode it produces 73hp and 95Nm. The efficiency is claimed to be 26.49km / kg CNG, but we put it through our real world test cycles to find out what the figures are.
  • CNG mode produces 15 percent less power than gasoline
  • Sit between gasoline and electric in running costs
  • 60L tank holds about 10 kilos of CNG

What is the true efficiency of Tata Tigor iCNG?

The iCNG version has no drive modes to speak of. We drove the car in petrol-only mode first, and it returned 10.68 kpl in the city and 14.72 kpl on the highway, averaging 12.7 kpl overall. In similar conditions, in CNG mode, it reached 16.85 km / kg and 25.86 km / kg in the city and highway, respectively, and thus averaged 21.35 km / kg CNG.

If we translate these CNG efficiency numbers into cost per kilometer, we arrive at an average running cost of Rs 3.53 per kilometer (cost of one kilogram of CNG is Rs 72 in Mumbai). Compared to the running cost of gasoline, the numbers come out to Rs 9.69 per kilometer (cost per liter of gasoline is Rs 120 in Mumbai), which is almost three times that of CNG.

For reference, de Tigor EVs Average running costs are only Rs 1.08 per kilometer, even if we take the cost of electricity as Rs 8 per unit, which is a high plate rate.

Analysis of Tata Tigor iCNG’s fuel efficiency

The Tata Tigor iCNG weighs about 100 kg more than its gasoline-only counterpart, and in order to lift the added weight without feeling lustful, its gear ratios are shortened. While the 1.2-liter engine does well to keep up with the traffic, you’ll have to operate the gearbox and turn on the gas to move, which takes a toll on fuel efficiency. Also, while cruising at 100 mph in the fifth gear, the engine spins at 3,200 rpm, which increases the amount of fuel it emits. For a more detailed evaluation, stay tuned for our upcoming Tata Tigor iCNG road test.

Fuel efficiency testing of Autocar India

Before our real-world fuel efficiency test, we fill the tanks of our test cars to the brim and maintain the tire pressure based on the manufacturer’s recommendation. These cars are driven at regular city and highway lanes and we maintain certain average speeds. To keep a check on any unfavorable variation, we always have a reference car driving by, one we have tested in the past; periodic driver changes further neutralize variations in driver patterns.

At the end of each cycle, we calculate efficiency by tanking them to the brim. For our in-depth test, there is only one person in each car who turns on the air-con and other electrical appliances such as the audio system, indicators and wipers as needed, just as a normal user would. We pride ourselves on our test data, which is not only consistent but also gives users an accurate indication of what to expect in the real world.

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