Thread: "Math question"

depends if they're the same car...

The first car travelling at 100 km will encounter more wind resistance as he is moving at a higher speed, which in turn means his car has to use more gas to power the engine so that it can hold the same speed against the wind.

So the first car will consume more gas.

Originally Posted by Chubz

The first car travelling at 100 km will encounter more wind resistance as he is moving at a higher speed, which in turn means his car has to use more gas to power the engine so that it can hold the same speed against the wind.

So the first car will consume more gas.

On the other hand depending what gear you use will also affect to result.
Amount of fuel used will depend how much car needs gas.
I would say that if that 200km is straight road car 1 (100km/h) will need less gas.

When you go faster, your gas intake is larger than if you go slower. That's why in driver's ed they tell you to save gas, give less gas.
So the car that was going fater took more gas regardless if the distance was the same.

That's not math by the way.

Originally Posted by Nympho

When you go faster, your gas intake is larger than if you go slower. That's why in driver's ed they tell you to save gas, give less gas.
So the car that was going fater took more gas regardless if the distance was the same.

That's not math by the way.

I agree... It's not math, it's common sense. No need to get technical.

well, anyway...difference between these two situations has really small marginal.
Max. 2L or so, Cos' modern car takes about 7-8L/100km when driving at 100km/h
with highest gear(not so much throttle).
And when you driving at 40km/h gear you use is 3 or 4 max, so yes you'll use less
throttle but think it like this: even with little acceleration with high gear and slow
speed you have to give alot gas to get car moving faster. Lot of gas+high gear+slow speed= enormous usage of gas.
And when "eco-driving", those who take part of races allways try to maintain
max speed/top gear cos' it is more economical than low speed/high gear, cos'
at low speed you need to use sick amount of torgue if you have to add the speed even a bit.
And that'll increase amount of gas used, also low speed/small gear combination sucks, cos' you'll have to keep high rpm, and that uses gas alot too.