Fuel economy

Date:         21 Nov 99 23:56:53 
From:         "Johan Stck" <johan.stack@tietoenator.com>
Organization: Enator
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Normal automobile crusing speed is abt 90 - 100 km/h.
However, if your main concern is getting the most km out of every litre of
petrol, I believe the optimum speed is around 70 km/h.
What about passenger aircraft?
Normal cruising speed seems to be abt. 750 km/h, but is there a similar
lower "economy speed" for passenger aircraft?