幾多轉開始超食油

highway constant speed kept at 80km/h to 90km/h (best fuel consumption)慳油.
rpm around 2000-2300 (AT 4 speed) depend on model with what gear usage,
vehcile with 7th gear (AT), kept at 90km/h ,rpm only 1600rpm.
slow motion (town) fuel usage increase
suddenly acceleration (worst)

應該講幾多咪開始超食油
平路80-83以上

it's hard to say without engine specs. It really depends on the torque curve and the gear ratio, turbo engine or naturally aspirated.

If an engine has max torque at X rpm, stay below X rpm and you'll be okay.

五千至8千係最食油,因為到左黎d轉數架車既加速力開始減低所以會比較食油,
最好keep住4千轉之前轉波,但要睇你drive咩車.

8轉開始超食油