計算每公里油(you)耗的費用，需用油(you)耗乘以油(you)價再除以 100 。

具體而言，油(you)(you)耗(hao)指的是車(che)輛(liang)每(mei)行駛 100 公(gong)(gong)里所消耗(hao)的燃(ran)油(you)(you)量，油(you)(you)價則是每(mei)升(sheng)燃(ran)油(you)(you)的價格。將這(zhe)兩(liang)個關鍵參數(shu)代入(ru)公(gong)(gong)式(shi)（油(you)(you)耗(hao)×油(you)(you)價）÷100，就(jiu)能得出(chu)每(mei)公(gong)(gong)里油(you)(you)耗(hao)的費用(yong)。比如，當車(che)輛(liang)油(you)(you)耗(hao)為 7 升(sheng)/100 公(gong)(gong)里，油(you)(you)價是 7.5 元/升(sheng)時，按照公(gong)(gong)式(shi)計算，（7×7.5）÷100 = 0.525 元/公(gong)(gong)里，即車(che)輛(liang)行駛每(mei)公(gong)(gong)里的油(you)(you)耗(hao)費用(yong)為 0.525 元。

此外，油(you)(you)耗的(de)(de)計(ji)算方式多樣，可算出(chu)(chu)百公(gong)(gong)里(li)(li)油(you)(you)耗后(hou)再進行相應換算，也可通過(guo)記錄加油(you)(you)金額與行駛里(li)(li)程來得出(chu)(chu)每(mei)公(gong)(gong)里(li)(li)成本(ben)，進而算出(chu)(chu)每(mei)公(gong)(gong)里(li)(li)油(you)(you)耗費用(yong)。每(mei)公(gong)(gong)里(li)(li)油(you)(you)耗費用(yong)會受(shou)到多種因素影響，像汽車(che)本(ben)身(shen)的(de)(de)油(you)(you)耗特性(xing)、當(dang)地的(de)(de)油(you)(you)價波動等。掌握每(mei)公(gong)(gong)里(li)(li)油(you)(you)耗費用(yong)的(de)(de)計(ji)算方法，有助于(yu)車(che)主了解車(che)輛(liang)的(de)(de)燃油(you)(you)成本(ben)支出(chu)(chu)情況。