Diesel engines vs Petrol engines fuel consumption difference?
hiter3600 asked:
For example we got 2.4L diesel and 2.4L petrol engine.
For example we got 2.4L diesel and 2.4L petrol engine.
1. I used to think that consumption comes from size of the engine (2.4L), but recently someone told me that diesel with about same size still consumes much less fuel that petrol engine is that true?
2. Is answer same for older engines 1990-1995 and newer 2000-2005?
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Diesel is much more efficient. We have a 05′ VW getting about 45 MPG steady. Gas just will not do that , even the hybrid will not do that unless the conditions are absolutely right. Also have an 01′ diesel pick-up lifted 6″ on 37″ tires and with some programming help am getting 15.5-16 MPG driving 75-80 mph on the freeway84 miles r/t per day. If the truck was gasoline it might get 10 MPG at 65 MPH. I know that sounds awful but i would guess 20 MPG is average economy in the US. On top of the fuel mileage you must also consider the longevity of a diesel motor compared to that of a gas.
I have both diesel and gas vehicles.
Diesel’s work well under continuous load, and gas engines are most efficient at part or full throttle, but not continuous load. So, some of it is determined by your driving and vehicle.
In a nutshell, with all things being equal, you should see a modest increase in fuel mileage with an equal displacment diesel, perhaps in the order of 20%.
I have never been able to realize much more benefit than that.
Newer engines are supposed to be better, but I am not really convinced. Newer cars tend to be heavier (more safety items like air bags) so the weight may be an issue. However, I suspect that older motors, with their freedom from emmission systems, may sometimes actually have an advantage. (Some old 240D Mercedes drivers say they could get 35mpg or better in their heavy sedans).
Is the smelly diesel, higher rebuild costs, and loss of high speed power worth the 20% savings with diesel? I cannot answer that for you. For myself, I sometimes doubt it. I honestly prefer gas, and have found the longevity of high speed diesels a myth (head job on Landcruiser at 100K) and the mileage expectations exaggerated.
Gas rules.
Diesel gives better mpg, and nowadays less carbon dioxide emmitions. Look at the new Polo Bluemotion or Smart Diesel.
70-80mpg from them and no road tax to pay if you live in the UK.
Diesel is more expensive: 97.9p per litre whereas petrol is 85.9p per litre.
Diesels are more fuel efficient part of the reason being that when you remove your foot from the accelerator, the diesel immediately goes back to only consuming the amount of fuel it does at tickover speed.
Diesel engines are made of more robust materials to cope with the higher pressures involved with the combustion process and they last longer too.
Diesel fuel is a lubricant whereas petrol isn’t.
I run a 1990 Peugeot 205 GRD with a 1769cc derv engine and my normal fuel consumption is 50 -55 mpg. (Yes it’s 18 years old !).
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