Mileage is one of the key parameters for new buyers, as well as for existing owner satisfaction. But the question that keeps on popping in everybody's mind is -
What is the real mileage of car and how different it is from OEM quoted (which is typically ARAI tested and specified) mileage?
Before we go ahead and explain the difference between ARAI specified and actual reported mileage, we at Wheelmonk did a quick analysis on these numbers to understand how large this difference is.
We selected a sample of more than 150 car models and compared the ARAI quoted mileage with actual user reported mileage.
So, what is the reason for this 20-25% drop?
In order to really understand this difference, you need to understand, how is ARAI mileage calculated?
ARAI tests the mileage in ideal conditions, which is a big reason for significant drop in real world.
While many natural conditions are stimulated in lab environment, they are still far away from real world conditions. The testing is done on a dynamometer (vehicle is parked on the rollers, which the car then turns, and the output is measured) with other natural conditions simulated
Some conditions that are set include
- A fan to replicate the air drag, which thrusts air of speed 18kmph on the car
- Temperature of the room is maintained at 25 degree Celsius.
- 2 passenger loads only is considered
But in reality, the chaotic nature of our cities and even highways, bad roads, long periods of idling, more extensive and frequent use of brakes and clutch pedals, higher car weight, etc. contribute to non-ideal situations
- Air-conditioning, which is standard in most of our cars, is not considered
- Most of the OEMs also use a strip down version, which means the weight of car is lower than what's available in the market
- In absence of any wear tear, the friction is much lower than real world conditions
The result being, a mileage figure, which is way more different than real world situation
Then, what is the best way to use this ARAI Quoted Mileage?
You can either reduce the quoted mileage by 25% to estimate the real mileage you can expect of your car
Or alternatively, the no can be relatively used to compare mileage across multiple models and can help you make that decision on what car to buy!