Now, let's fix the efficiency of the motor system to 15.73% above (although it originally changes depending on the driving situation), and consider the relationship between running resistance and fuel efficiency.The basic condition settings are the same as in the previous example, but it is a simulation of how much effect it will have by changing only the numerical values ​​that are likely to be related to tuning.
It's a little troublesome at first, but if you use spreadsheet software, you can instantly perform various verifications, so please try it yourself. It can be seen that there is a certain difference even when traveling at a constant speed of 40km / h.

・ A / b (km / L) = 33,000,000 (J) x0.1573 / total running resistance (N) x 1,000 (m)

・ When the rolling resistance coefficient increases by 10%, the calculated fuel consumption becomes 18.53 km / L, which deteriorates to 92.64%.Although it changes depending on the road surface condition, it is the latest theme of technological development of tire manufacturers, so it is a caution item when selecting tires.In principle, the larger the grip force (friction force), the higher the rolling resistance.Increasing the air pressure with thin tires will reduce resistance and improve fuel economy.If you have tires that emphasize cornering performance, you need to be prepared for it.
・ If the vehicle weight is increased by 10%, the calculated fuel consumption will be 18.58 km / L, which will deteriorate to 92.91%.The setting of no acceleration and no gradient has less effect than the rolling resistance coefficient (because the occupant weight has not changed).This is about 1345% (10 kg) of the vehicle weight of 135 kg, so if you are nervous about the effects of body reinforcement, you should try to calculate with actual values.
・ If Cd (air resistance coefficient) is increased by 10%, the calculated fuel consumption will be 19.59km / L, which will deteriorate to 97.96%. At low speeds of 40km / h, the ratio of air resistance is small (about 20% of the total running resistance) and the effect is small.
By the way, if you increase the speed by 10% without changing the Cd (→ 44km / h), it will be 19.16km / L, which has a greater effect.This is because it is proportional to the square of the speed. At 100km / h, Cd = 0.33 will be 9.58km / L, and Cd = 0.363 will be 9.02km / L.