Dear Dr Abaas

your question is not rigorous as you didn't mentioned the vehicle weight, the engine horse power. However, in general the fuel consumption increases with the conditions you indicated.

Regards

Hi,

The question, as it is, has no answer. To be able to say "how much" you need to exactly know your vehicule and the driving conditions (velocity, vehicule weight, efficiency of the engine, etc etc).

However, from a methodology point of view, you can begin the problem by appying the second law of Newton both on flat and 1 degree road. From this you can determine the actual energy you need, but only if you define the conditions as said earlier.

Have a nice day

This question can be answered by measurement or simulation. In case of simulation,  the driving resistance have to be calculated. After that, the operating point of the engine (as a function of the actual gear) has to be defined. Based on this information, the fuel consumptio0n can be calculated by use of engine operation maps. The following publication may provide some information to solve the problem:

https://www.researchgate.net/publication/280303367_Basics_of_longitudinal_vehicle_dynamics

Kind regards,

Mario

Conference Paper Basics of longitudinal vehicle dynamics

Dear  sir Mario Hirz thank you for answer and for paper .