Hyundai i20 and Maruti Suzuki Swift are the best hatchbacks that you can buy today. Both offer strong performance, good fuel efficiency and class leading features. Both cost roughly the same too (the i20 might be more expensive but offers a whole lot more. The mid variants of the i20 are priced similar to the Swift and offer similar equipment). But it is the i20 which emerges as the winner here thanks to better built quality, better list of equipment, shorter waiting period and a wider variant range. The Swift is still the better car for the highway, but for most the i20 is the more practical option.
Initially, Hyundai Elite i20 Magna comes with a petrol and diesel engine but a CNG kit can be fitted with the one which has petrol engine. You will have to sacrifice with power to get more fuel economy and if you convert a petrol car into a CNG car, you may loose the warranty on the car and resale value of CNG cars is lesser than petrol cars. It is always recommended to get the CNG kit fitted from the authorized service center so that you can avail the warranty services as well. Moreover, the performance will depend on how the car is driven and maintained.
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How much fuel goes into a car varies on a lot of factors. Now you haven't mentioned how many km did you drive post the low fuel warning light as that could also determine how much fuel goes into the car. Even though the manual says that the tank capacity is 45 litres, the amount can vary by a small margin, give or take 2 or 3 litres. Also filling fuel in the hot day or in the night also makes a difference considering fuel expands during the hot day and contracts when the temperature is cooler. All said and done, make sure you fuel up within 3 to 4 km after the low fuel indicator light pops up.
It is very simple, in 175/65R15 tyre 175 is the width of the contact patch or the area of the tyre that touches the ground, 65 is the profile of the tyre or the distance between the inner and outer circle of the tyre, both of these are in millimeters. While, R15 is the diameter of the wheel or the inner circle of the tyre, it means, in this case, the tyre has an inner diameter of 15 inches.