Quote:
Originally Posted by newtonsfirstlaw
I've been playing with values in my fuel economy spreadsheet, and come to the conclusion that one of the biggest problems we face with fuel economy is excessive speed.
For example, I save 1/4 of the fuel with my car by going 20kph slower, from 100kph to 80kph. With other driving techniques, the difference is more. e.g. P&G ICE ON, 33%, P&G ICE OFF, 37%.
I simulated it with a typical full sized sedan (Ford Falcon), and the gain was 20%, and getting roughly 4.8l/100km at that speed.
Got any comments, slogans, or ideas?
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Quite an impressive running economy.
For a comparison my Commodore (2003 V6 Acclaim auto with a/c) manages around 5.5 / 100 km ( actual not simulated ) at 90kph.
Engine speed is around 1750 RPM.
Interestingly dropping the road speed to 80 actually increases the fuel used.
I am not sure why but I think the engine is off the fuel economy "island" on the fuel map and efficiency suffers as a result.
I have been using this same technique for years both the save fuel , my licence and the engine. Big engine (3.8 litres) rev slowly = good economy.
Pete.