Poor Fuel consumption in Toyota Yaris?
That really is awfully much... that s around 11.5L/100km... that d be rather normal for a BMW 530i (with 231hp!) but surely not for such a little car, there really must be sth wrong with it or you re driving at the maximum rpms all the time... I really doubt that it s possible to get a Yaris 1.3 to consume that much... even if you re spending 80% of the time in traffic jams, it should be hard to get it to such an immense fuel consumption. The consumption should be around 6L/100km (so around 16.5km/L). I harldly can imagine that you manage to push the consumption to overwhelming 11.5L/100km...even if sth is very wrong with your way to drive. Even if sth was very wrong with the fuel injection and the combustion, it rather is impossible to push a 1300ccm car to consume 11.5L/100km. The only thing I could think of is that you re running the car without any oil, then the fuel consumption can raise a lot but you d have recognized that. Or maybe someone is constantly stealing your fuel....
How is fuel consumption affected when driving in a wrong gear?
Typically a higher gear gives you a better fuel economy. Based on some studies we had done for my startup with cars, you could have seen anything between 10–25% improvement in fuel efficiency by going to the higher gear. Check the attached image. This is from a 5 gear car, I think the 6 gear will be an extension.Note that each gear has a fuel efficiency sweet spot. Further increase in speed, beyond the sweet spot bring the fuel economy down.For more information about this analyses: How Speed and Gears affect Fuel Economy - Yatis Blog
How to save my fuel consumption.......... it drive me crazy?
As well as the above, make sure your tyres are inflated correctly. Don't carry any unnecessary weight around in your car. If you have a roof rack fitted, remove it. Watch how you accelerate, if you put your foot to the floor you will be using more fuel. Read the road ahead as far as you can see so that you are using forward thinking. Doing this will alert you as to whether you are going to need to slow down, thus preventing sharp braking which for some strange reason, uses more fuel. If it's possible where you live, go on an advanced driving course which will help you with the above (not saying you are a bad driver...just a suggestion) Some tips I just saw on a website..... How can I save fuel? There are many ways to reduce fuel consumption. Here's a few simple ones that will not only help you save fuel but could give your car a longer lifespan. Drive in a conservative manner Avoid hard acceleration and severe braking - brake evenly before a corner and accelerating evenly out of it. If driving a manual, use the right gear at the right time - don't let your car labour in the wrong gear. Avoid driving in peak periods Buy a fuel-efficient car - it can save you a lot of money and spare the environment up to 20 tonnes of greenhouse gases over the life of a car. Buy a car that suits your needs - big and powerful cars use more fuel, so if you don't need the extra size and power, don't buy it. Avoid short trips - walk or cycle instead. Plan your trips - do a number of errands in one trip rather than several trips. Service your car regularly Don't speed - at 110km/h your car uses up to 25 per cent more fuel than cruising at 90km/h. Don't idle for long periods - if possible, turn your engine off. Look after your car's tyres - keep them inflated to the most suitable pressure and make sure they're properly aligned. Use airconditioning sparingly Travel light - the more a car carries, the more fuel it uses. If you do a Google search you will find many sites which offer constructive advice. Best of luck....
Fuel consumption difference between of 1.4 Litre & 2.0 litre car.?
Not necessarily, fuel consumption has a lot to do with engine size but it's also dependent on the size of the vehicle, how much the vehicle weighs, aerodynamics, drive train efficiency, gear ratios, compression ratio, tire size, tire inflation etc. As you can see, there are far too many factors to be able to say "this one has a smaller engine so it'll get better mileage." Awesome has his facts wrong. Liter size of an engine has nothing to do with how much fuel it uses in an hour, it's how much air the pistons displace in one revolution. I'm not sure if he was joking or just misinformed. Some Semi-trucks (lorry?) have 7.3 liter engines, the same as an old Firebird, which do you think get's better mileage?
BMW 5 series (530) e39 2002 fuel consumption is very high, it is not getting bellow 24L/100KM any ideas?
Are you calculating ACTUAL fuel consumption or going by the car's onboard computer? The 530i should be getting better than 11 l/100 km so even 16 is abysmal. And 24 is in the basement, that's 10 MPG... my 33 foot motorhome gets better!! I doubt this is accurate. Mainly because the car would barely run and you would be puking out black smoke from the tail pipe. So first things first. Swipe the insides of the tail pipe (when cold) with your finger. If it is very sooty and black your car is indeed running rich and consumption is high. If it isn't there is an issue with the OBC (OnBoard Computer). Have this checked at an independent BMW repair shop. The economy meter takes into account injector pulse, engine RPM, throttle position, vehicle speed, and possibly engine vacuum, and engine and ambient temperature when calculating economy so any one of these can have an impact on PERCEIVED economy. If it is black there are a couple of things that can affect your fuel economy. First is an unmetered air leak. If the car doesn't run as smooth as it should, especially when cold, this may be the problem but I have never heard as bad as 24l/100km. This should also prompt a check engine light (CEL). If your MAF or O2 sensor is defective the car will go into default mode but typically it will also give a 'check engine' warning. I have seen defective MAF's not do this. The MAF is in line with the air filter. There is an electrical connection that is a large round connector on the MAF itself. Start the car and turn the round connector and unplug the MAF. The car should stumble and give a CEL. If it doesn't this may be your problem. Are you using a K&N or other oiled air filter? Get rid of it! Next is the engine temperature sensor. If the DME (engine computer) thinks the engine is cold it will cause the car to constantly run rich. You will have more power than usual but fuel economy will suffer. The DME's temperature sensor is the blue one on the thermostat housing. I would highly recommend spending the $75 and having the OBDII (On Board Diagnostics) plugged in to tell you anything and everything wrong with the car. From the fuel economy meter to a speed sensor to a temperature sensor and everything in between... it will even tel you if the rear demister relay is pulling in or not. BMW's diagnostics is very, very comprehensive and this will pinpoint the issue in minutes.
Does skipping gears decrease fuel consumption?
I hope my info helps here, I drive a Ford 1.5 TDCI car. There is an instant fuel efficiency computer in it and displays data almost instantly. There is also a documented point for my car that driving it between 1250–1750 RPM will result in highest fuel efficiency and performance and believe me it sure does. And also this is sweet spot for my car.So depending on the road gradient\passengers in the car\tire pressure, try to maintain these RPM range and shift to which ever gear is suitable for these conditions, it will definitely give you the best Fuel efficiency.Now accelerating up to 60 in 2nd may require more or less gas for above mentioned conditions. So you may want to shift to 4th and if there is reasonable RPM, then shift to 5th. Because lugging the engine will anyways consume fuel equal to what you spent accelerating in 2nd.
When my AC is on, my car tends to consume more fuel as I have observed it several times, is there anything wrong with my engine or what?
Your air conditioning compressor runs off a belt driven from the engine. When you are using your A/C, the compressor puts a load on the engine and the engine has to work a bit harder to run the compressor. This uses a bit more gasoline.The amount of gas your particular car uses to run the A/C will depend on the exact car you are driving and how you are driving that car. Some cars are more efficient than others, some compressors need more power to operate than others. A big SUV is going to have a larger compressor than a small economy car - the SUV has more space to condition. A Mercedes Sprinter passenger van with rear air conditioning has two compressors.Another answer talks about a Mythbusters episode where they used two SUVs to test the theory that air conditioning uses more fuel than opening the windows. In this case, with these cars at the speeds they were driving, they found that the air conditioned car went 15 miles fewer than the car with the windows open for a full tank of gas. That’s about 1 gallon of fuel for that particular SUV - about 2 bucks a tank at present US gas prices. That’s all well and fine, but they only tested two particular cars, only at one particular speed. That’s hardly a representative test. Aerodynamics of different cars are very particular to the car. I’m not trying to say that air conditioning doesn’t use more fuel than opening the windows, maybe it does on all cars, maybe it doesn’t, just that their testing methods aren’t conclusive across all vehicles and speeds.I don’t want to drive in hot humid Atlanta when it is 90F outside with my windows open. I’m going to risk using a bit more fuel by closing the windows and using the air conditioning, arriving cool and sweat free. I don’t want to drive at 75mph with my windows open because I’m not willing to burn a bit more fuel for my air conditioning.
How can ECU manage fuel consumption in a vehicle?
There are many things that contribute to fuel consumption. To begin, the o2 sensors in your exhaust sense how complete the combustion in your engine is by reading the amount of oxygen gas. These sensors usually have 3 wires (power, ground, and signal). The sensor sends the signal back to the ECU telling it how much more fuel to send into the pump and through the injectors. Many other sensors (called input sensors) send signals to the ECU and will help determine how much fuel should be sent. This also includes the mass air flow sensor which tells the ECU how much air is coming in. The car wants to remain a constant air:fuel ratio of about 14:1 and telling the ECU how much air is coming in will tell it how much fuel to output. Sensors that you wouldnt even think apply to fuel output also contribute, such as the coolant temp sensor. The hotter your car runs, the more fuel will be sent into the engine as a fuel-lean mixture can often contribute to overheating. Our cars are very smart machines, so many things we wouldnt even expect are all interconnected using just some wires and computers.
Can throttle body affect fuel consumption if faulty?
It depends on what kind of fault there is, but I will approach this from a very broad standpoint. Fuel consumption in newer cars is managed by many different systems working together to get you the best gas mileage, if one of the systems is out of whack then the fuel consumption goes up. The throttle uses a sensor to determine how open it is, if the sensor is wrong then the fuel/air ration in the computer is being computed wrong. This difference is directly related to how incorrect the sensor is and can mean a major decrease in MPG.
How true is it that a catalytic converter reduces the fuel consumption in a car?
Not true at all. Catalytic converters make sure reactive exhaust gases (particularly CO) get completely burned before being sent out the tailpipe. This, in and of itself, has no effect one way or the other on the use of fuel. However, anything in the exhaust path causes resistance, and thus requires a bit of energy to push the gases through — which is also true of your muffler. This energy has to come from somewhere, and it comes from the pumping action of the piston on the exhaust stroke. The piston, in turn, is powered by the air-fuel mixture, so making the piston do more work means the engine consumes more fuel, not less.It’s not a huge amount of extra work, and the benefits are well worth it (as they are with a muffler), but it’s “not even wrong” to say catalytic converters reduce fuel consumption.