There are so many factors affect the fuel consumption of vehicles. i.e. road geometry, grade, wind, weather, driving behaviour, conditions of the vehicle. What is the dominant one?
For a given vehicle type, the predominant factors are gradient and driving behaviour. (For gradients, I am thinking -10% to 10% slope).
For fuel consumption as for vehicle emissions, I recommend the following resource:
http://www.hbefa.net/Tools/DE/MainSite.asp
The database does not provide information on driving behaviour, though. From my own experience.... my wife's fuel consumption is in average about 10% higher than mine - using the same car. On a 10% uphill gradient, fuel consumption approximately triples. So, it is not balanced by using no fuel on the downhill gradient.
I expect the influence of driving behaviour varying depending on the circumstances, e.g. enforcement of speed limits. It may be difficult to find data applicable to the specific situation you are looking at.
I also find the driving behavior the most dominant factor. However it is very hard to estimate the span, because of many circumstances. The road is one of the things allowing or forcing the driver to consume the specific amount of fuel, but the vehicle itself is the one as well - 100 kW engine allows you usually to consume more than 40 kW, but it need not always do, when driver uses only 20 kW for his daily driving. The car manufacturers collect the data from customers, sometimes do the benchmarking of the competitors or use the databases (e.g. fueleconomy.gov). The press sometimes simulate the different driving styles in their test reports (Auto Motor und Sport), but to be consistent the driving behavior is always consistent during test, thus only realistic to some extent. It can be CAE simulated though, please see my publication.
The most dominant factor is tyre pressure and condition , shock absorber condition , road type and vehicle speed
Наистина факторите влияещи на разхода на гориво са твърде много, но според мен трите най доминираши са:
- квалификацията на водача;
- състоянието на пътната настилка;
- техническото състояние на превозното средство и качеството на горивото.
Темата е много обширна наистина.
I just checked the online version of the HBEFA database. Probably, it doesn't give sufficient detail. You'll find more information on the full software capability here http://www.hbefa.net/e/index.html I believe, the data may be valuable to your study (e.g. average fuel consumption for various vehicle types, traffic conditions and gradients). I used it frequently for emission calculations.
The two dominant factors affecting fuel consumption are road gradients and vehicle acceleration. Driver behavior becomes important particularly in city driving, as it determines the repetition of slowing down (with or without using brakes) and subsequent acceleration cycles, as well as the speed and acceleration levels.
One of the most important factors is the road conditions, this includes the gradient. This factor determines or influences others such as speed and acceleration
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