If there were no speed limit, how fast would you drive on the interstate/freeway/expressway/autobahn, etc?

I'd go about 80-85MPH. (137 km/h)

How about the rest of you?

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if there were no speed limit...


I'd crash.

On certain sections of the autobahn the speed limit is open, I would usually drive about 80mph on these sections.

The fast drivers tend to go at around 110-115mph. I would not go at these speeds as my concern is economy ..... of course once in a while I'd put my foot down for a few miles

I always understood that the faster you go, the less petrol is actually used. Also when you go on long distant drives you use less petrol in x miles than you do with the same amount of milage with short runs in town.

As fast as the car can go without losing too much control or doing damage to the engine. Other cars potentially 90-100. Open straight away with very few vehicles 120 mph sounds about right. I do 80 in the sections I know aren't likely to have speed traps as is

Oh really?

But then the faster you go, the more pollution you make. Or at least that's what I think happens because sometimes they lower the speed limits here because of pollution peak times.

I'm ok with our current speed limits. 50/90/110/130 km/h

That is horribly wrong.



Anyways I would probably do a steady 90 or so on the interstate. It's what I do now and is a really comfortable speed. Wish I could do it legally.

Yep, you are right, although its not to do with distance and speed, it is all to do with RPM.

The most economical way to drive is to go as slow as you can whilst in the highest gear. For the majority of cars this would be between 50-60mph whilst staying in 5th gear.

The difference between long distance driving and city driving is again to do with RPM. It depends on the vehicle, people will generally change gear at 4,500RPM and are constantly climbing through the gears continuously as they stop and start and weave their way through urban streets, so in this instance the RPM goes repeatedly from 2,000-4,500. It would be more economical to drive on a large road where you only climb through the gears once before you cruise at 2,500RPM.

Side note:This is also one of the big mistakes people make when purchasing a used car, they look at the mileage! 100,000 urban miles does a lot more damage to a car than 200,000 motorway driving would. Its always worth asking where and how the car has been used.

Well considering I do 80-90 now with the speed limit 65 and I've lived over in Germany using the Autobahn, I'd go flat out as fast as the fricken car would go to which I would still feel safe. It really irks me when there are slow drivers in the fast lane.

I'm usually comfortable around 80.