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 providing 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

·         High way/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 certain drive style). In USA and UK most relevant is Miles per gallon measure, how many miles car is able to drive on 1 gallon of fuel. Those values can be simply converted each to 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 count average trip fuel consumption using the sum of fuel used by engine during by continuous trip divided on distance. Continuous trip it's a period(s) when engine is on with allowed engine off periods no longer than 120 minutes. After 120 minutes 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, maximum speed 50 km/h and should simulate 13 minutes trip with an average speed of 18.35 km/h.

Combined style test according to NEDC simulates 20 minutes 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). Total duration is 400 s. (6 minutes 40 seconds) and 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 on autobahn 20 minutes with a top gear position and next 34 kilometers with a speed 120 km/h. 

All of 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.