By adjusting Mixture with Bosch KE3-Jetronic Mixture Adjustment
High fuel consumption on an EFI could be caused by a bad O2 sensor. Another reason for high fuel consumption is a dirty air filter or oil filter that needs to be changed. Electronic Fuel Injection vehicles are also famous for clogged fuel injectors.
High fuel consumption
Yes but not by much.
open manifold.
Service it
There are several causes for high fuel consumption in a diesel engine. These include a difference in the weight of the vehicle, increased usage of air conditioning, and a difference in tire pressure.
Yes it sure can.
Several problems can cause high fuel consumption. An engine that needs a tune up, a slipping transmission or a problem with a sensor giving bad information to the computer can all cause low fuel economy.
generally speaking, fuel consumption is higher in low gears because the rpm of the engine is higher. Performance is measured in kilometers/gallon. You have to consider that cars are designed for optimum performance when you drive at around 80 km/hr. For each car there is an optimum ratio distance/fuel consumption.
not much spoilers are only effective at very high speeds
Most common cause of unusually high fuel comsumption is a fuel leak. Other possiblities include leaking injectors, faulty O2 sensor, vacuum leak or incorrectly adujsted intake valve.
Bad fuel pressure regulator, Map. sensor not working or the vacuum line is bad or off of the sensor. You did not say what year it is.