Fault with the clutch probably.
That would depend on the gear ratio between the engine and the wheels, and in the diameter of the wheels. The transmission of the car lets you change the gear ratio, so in low gear the car may be going 15 MPH, while in high gear the car may be going at 70 MPH.
Transmission is going
may be second gear or third gear with preparetion before you go down hill
Gear shifting has little to do with batteries, or your car's electrical system. If your car is stuck in one gear, your clutch (on a manual) or even worse, your transmission, might be going out. The dead battery might be just a coincidence.
Probably, since you are working the engine too hard at that gear.
The pivot bearing can cause your car from going into gear, once the car is started. The pivot bearing is located in the transmission.
Harmonic balancer
even though you are driving to the same place, if you are going fast and you are on a high gear e.g. gear 5, as to going slow on gear 3 you are using more car energy so you are using more petrol going fast.by Georgia davies
It means that the car can barley get enough power in the gear to move car. Just barley. It is probably that you're using a manual transmission and you moved from 1st gear to 2nd gear without going to the minumin speed and power. This also means that you don't know how to use the transmission itself.
you are going too slow for that gear your engine has very little torque at low rpm
The antipollution filter on a 207 peugeot comes as an indicator that the car has to be cleaned by reving it.
Well hopefully your not going from 5th gear speeds stright to 1st... but go to a tranny shop and explain the problem