Weight. Higher loading causes more tire flattening, which increases rolling resistance. In addition, the engine, when accelerating and driving uphill, mobilizes more power to move the car forward. Every 100 kg of additional load costs up to 1.2 liters of fuel (additionally). Therefore, all unnecessary things must be removed from the car.
Windage. roof rack (especially if the luggage is bulky) or a large frontal area of a caravan during continuous movement causes high fuel consumption. When moving around the city, the influence is less pronounced. If possible, remove the trunk or try to place luggage inside the car during the trip. At speeds over 80 km s, even an open side window or sunroof increases air resistance.
Trailer. A caravan, trailer with a load or a boat increases fuel consumption depending on the weight and air resistance.
Engine influence
internal friction. If a new engine is installed, then for the first 2000 km of run it needs more fuel than afterwards. The fact is that the working surfaces of pistons, bearings and shafts have not yet become used, therefore, large friction forces are overcome. Too thick engine oil increases the friction resistance in the crank mechanism, especially in the warm-up phase after a cold start.
mechanical condition. Too little compression due to worn cylinder surfaces, damaged valves and piston rings increase fuel consumption.
Graduation system. The depressed exhaust pipe, due to the reduced cross-section, prevents the exhaust gases from escaping. Engine power is reduced, fuel consumption is increased. The rusted exhaust pipe has a reduced "velocity head". The system setting is broken. engine power deteriorates, fuel consumption increases.
Idling. Too high idle speed increases fuel consumption. In addition, the braking effect of the engine on slopes is worse.
Dirty air filter. Dust sucked together with air is deposited in the pores of the filter, the holes pass air worse. The engine lacks air, which is especially bad for the diesel engine.
Driver dependent factors
Riding in a convoy is worth the extra cost, this should be remembered when it comes to comparing your practical fuel consumption with experimental data (see table).
Movement speed is the most significant factor. If the speed increases, the rolling resistance of the tires increases due to the increase in the work done while rolling. Air resistance is even more important. At 100 km h it is increased by 4 times.
Driving with full throttle increases fuel consumption. Even when driving fast on the motorway, do not press the accelerator pedal all the way down. If you slightly lift your foot off the accelerator pedal, the speed decreases very little or not at all, but the consumption decreases. Test at what position of the accelerator pedal the speed decreases On hills, too, it is not always necessary to give full throttle.
"sports riding": starting from a standstill at full speed, accelerating at high speeds, hard braking - all this causes a lot of fuel consumption.
So-called "regassing" is not only redundant in a fully synchronized gearbox "Volkswagen", but also causes excessive fuel consumption.
Additional engine warm-up "eats" useless fuel. An unloaded engine warms up very slowly. This means extra wear* and unnecessary noise.
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