How we measure data for statistics

InCarDoc statistics processing methodology, collected by application users:

InCarDoc Server receives from mobile clients summary file(s) with fuel usage. Statistics is split by time intervals with 5 minutes duration (or less). Our server uses calculated average speed for each interval to determine driving cycle style.

The following rules are defined for statistics files:

International methodologies to measure average fuel consumption statistics

Car makers provide some values of fuel consumption per each car model and engine configuration based on their own methodologies. There are 3 main driving cycle types with measured fuel economy defined in the world (it names and methodology depend on regions according to a WIKI specification):

·         Urban/City

·         Combined

·         highway/Extra Urban

In EU countries, it is considered to measure fuel consumption (economy) in liters per 100 Km (how many liters are required for a car to pass 100 km distance using a certain drive style). In the USA and UK, the most relevant is miles per gallon measure, how many miles a car can drive on 1 gallon (3.79 liters) of fuel. Those values can be simply converted each to the other.

In the European Union, The New European Driving Cycle (NEDC) methodology is used mostly to measure CO2 emission and calculate yearly transport charge. Most likely, all car vendors in Europe markets are using this methodology, providing fuel consumption for Urban and Combined styles. This methodology is measuring engine fuel usage on a special automated stand, not in real life.

One more methodology - WAG (Volkswagen and Audi group) continuous trip definition. WAG counts average trip fuel consumption using the sum of fuel used by engine during by continuous trip divided by distance. Continuous trip it's a period(s) when the engine is on with allowed engine off periods no longer than 120 minutes. After 120 minutes, the engine off delay computer resets average statistics data.

Urban style according to NEDC assumes engine heating time after cold start, several accelerations and car brake (stop) cycles, a maximum speed of 50 km/h and should simulate a 13-minute trip with an average speed of 18.35 km/h.

Combined style test according to NEDC simulates 20-minute trip within City (including some engine heating time) and out of the city with an average speed of 33.6 km/h

Extra Urban style represents more aggressive, high-speed driving modes (usually typical of highways). The total duration is 400 s. (6 minutes 40 seconds) and the theoretical distance is 6956 meters, with an average speed of 62.6 km/h. Popular German issue AutoBild has another highway methodology: measure fuel usage driving oAn autobahn 20 minutes with a top gear position and next 34 kilometers with a speed of 120 km/h. 

All the tests do not assume any electricity system usage (climate control, lights etc), extra weight except the driver, 20 C air temperature, no wind and other ideal conditions.