Do you buy Motor magazine?? They covered this in quite a lot of depth about 6 months ago. Maybe you could e-mail them and see if they will send you the article back. It would have been written by Barry Lake (I think he's a member here as well, maybe PM him) in Technically Torquing.
He did a large economy run in a new falcon or commie, and compared economy driving, normal driving, and leadfoot driving, and the results were very interesting, there was a massive difference.
Hope this helps
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for minimum emissions engines burn air/fuel at a 14.7:1 ratio (by weight)
under heavy acceleration that ratio can go down to as low as 12:1 or so.
so as you accelerate harder, your air/fuel mix is richer (to provide max power) as well as the fact the engine is moving more air as it is revving harder.
a 2.0L engine running at stoichiometric air/fuel ratio (14.7:1) will use half the fuel of a 4.0L engine running at the same revs, in theory (im talking about running them on a bench, not in a vehicle, which adds a lot more complications)
is that sort of what you wanted?
thats off the top of my head late at night - you could try www.howstuffworks.com it might have some good stuff.
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Fuel Economy and Cylinders
No 1 The load, the loading cycle(use) and gearing contriubute more to the fuel consumption figures than the capacity and number of cylinders by itself. Cylinders numbers are based on the amount of acceptable 'power pulses' per crankshaft cycle and drivetrain tolerance. One cylinder engines can be more efficient than multi-cylinder layouts for example, but the workload(task) define the layout and capacity, but in the motor car marketing is the determing factor more than anything else! Different engines have diverse roles to fulfil and cannot be objectively compared readily unless they are of a similar working(task, role) group.
No 2 Similar in answer to No 1 the load for an engine and it's gearing and it's use govern it's general working efficiency.
Driving style can be a variable load unlike a generator(static engine) which has constant load and load cycle.
Driving in a manner that is appropriate to the driving conditions at hand i.e, by using the correct gears and momentum(enhanced driving style) as opposed to 'overworking' by over extending the motor and driveline for the amount of work(loading) required at that given moment.
No 3 Scheduled servicing and types of loads and load cycles effect the way in which a motor carries it's age, obviously. For instance diesel's last longer than petrol but two strokes last the least longest when major overhauling is to be considered. How the motor was originally bedded in and was the engine tied to the correct task throughout it's working life and treated accordingly.
On another note look at what a particular engine burns. Diesel, petrol, lpg, ethanol etc all burn with different characteristics that will give an idea to what the engine is for or going to do(work) Basically internal combustion engines are just glorified 'air pumps'.as opposed to external combustion engines(steam trains) which create their own air pressure(steam).
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