Short summary
Factors to consider

• Engine efficiency: how much fuel to how much power.
• Transmission Efficiency: power delivery from engine to road.
• Aerodynamics: how hard is it to move forward faster.
• Weight: manufacturers estimate over actual weight now.
  
• Transmission design: is it for speed e.g.CLK tops at 320kmph or power e.g. H2 tops at 180kmph (same engine size).
• Manufacturers intention: e.g. Bugati over Prius.
• Driving Style:
  
• Wear and Tear: especialy in the Engine, Transmission and suspension.
  

Top gear also did another trial where they tested a Toyota Prius 1500 cc with a BMW cant remember the engine size, so Jeremy was to drive the BMW and just keep up with the Toyota turns out the Toyota actually consumed more, he concluded " its not the engine size or the car, its how you drive"

This episode started with Jeramey racing all the big sport cars on 1 gallon of fuel and it resulted with Ferrari being worst and Audi being most efficient (Actually overlapped the Ferrari).

The lesson behind the Prius test was how you drive. for example take the comon driver and ask them Toyota 1.6 and a Merc 1.6 which consumes more (vague question) all will settle on Toyota, try the same with a larger engine and toyota will be wrong. In reality taking all factors into consideration especialy vehicle power and weight Merc is more efficient but whe you look at Kilometers per litre their is a different scale.

Vehicle efficiency is best at cruising speed this is the highest speed the car can do on low revs and a high gear without losing speed. usualy 3rd gear at about 90kmph.

Small engines are more economical at low speeds e.g Vitz, Big Engines are more economical at high speeds e.g. (Pick any). Engine size is relative to power which is bound on Engine Type Have to mention Marda RX8 is only 1500cc but is competition for the Porsche at 3000cc coz its a rotary engine and consumes like a 3000cc,

To answer the original question how efficient is 2500cc, google the make and model of the car not the engine. also consider the extras that come with the engine e.g. EFI, VVTi, Turbo, SC, e.t.c

Ashford K. Maina,

Casey Stengel  - "All right everyone, line up alphabetically according to your height."

2009/6/24 Steve Muchai <smuchai@gmail.com>

2009/6/24 Watson Kambo <wkwats@gmail.com>
[...]

>and I have proved that if you drive moderately and let it pick speed gently then I save on fuel ... I know you get the drift
>

Totally true. Alfa Romeo Owners Club have an annual Economy Run to
Naivasha which demonstrates this. Was held the other weekend  and was
quite annoying especially after the end of the dual carriageway, since
I wasn't doing any economy driving myself!

Maintenance plays a big role. Worn piston rings, old spark plugs or
simply a clogged air filter are examples of stuff that will definitely
ramp up your consumption, but driving style is definitely a major
contributor to good/bad consumption.

BR,

S
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