What I should have said earlier, sometimes it's the destination that 
decides the priority of speed. For us, generally 10 -11 hours of driving 
a day is max. We don't generally drive distance at night. It depends on 
sightseeing or other things along the way. Usually we try to do other 
things while we are in an area, and the open times for those items 
sometimes prioritizes the schedule. Most of the time we like to get 
there as quick as possible. On a multiday trip. saving a night's lodging 
and a day's food, could easily be more than the extra fuel.

On 7/17/2010 3:14 PM, Tamas Rudnai wrote:
> Just made a test with my new car on motorway, and it makes around 47mpg
> (imperial) by doing 70mph using the aircon. As I am just about travelling
> throughout Europe I have calculated that it is about to spend 450 pounds in
> a 2186 miles journey, including EuroTunnel tickets and motorway fees in
> Austria and Hungary.  Quite steep compared to the flight ticket...
>
> Anyway, I also started to be curious how much time can I save by driving
> fast. So I took the speed limit in each countries, calculated the distance
> in each of them and played "what if". What if going on limit, or driving
> slower or higher. In a 3 hours journey from Calais to Luxembourg (which is
> my first stop) I can only save 30 minutes if I constantly speeding by 20
> km/h (compared to driving on the limit). Then from there to Budapest, if I
> go really fast on the German motorways (around 200 km/h), then I can save
> about 2 hours through the 650 km distance have to make there. That is
> something significant, however, even the fact that there is no speed limit
> in Germany, I have some doubt if it is possible to maintain that high speed
> (someone is always in front of you or there is a construction, or there are
> speed limits on bends and bridges etc... so shall we say 1 hour saving would
> be realistic?
>
> Now here is the hard part: How much extra fuel my car need for the higher
> speed? I could not find any information to that. Is there any good page or
> statistics for this kind of information?
>
> Tamas
>    
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