What This Calculator Does
The VinFast Monthly Fuel Savings Calculator estimates how much money you could save every month by trading your gasoline car for a VinFast electric vehicle (EV). It compares the cost of buying gas for a conventional car against the cost of electricity to charge an EV that drives the same number of miles. Currency is shown in US dollars, but you can use it anywhere by entering your local fuel price and electricity rate in the same currency.
How to Use It
Enter five values: your monthly mileage, your current gas car's fuel economy in miles per gallon (MPG), the price of gas per gallon, the EV's energy consumption in kilowatt-hours per mile (typically 0.25–0.35 kWh/mi), and your electricity rate per kWh. The calculator instantly shows your gas cost, your EV charging cost, the monthly savings, and the projected annual savings.
The Formula Explained
Monthly gas cost equals miles divided by MPG (gallons used) multiplied by the gas price. Monthly EV cost equals miles multiplied by kWh per mile (energy used) multiplied by the electricity rate. Savings is simply the gas cost minus the EV cost:
Worked Example
Suppose you drive 1,000 miles a month in a car that gets 25 MPG, with gas at 3.50/gallon. The gas cost is
使用注意事項與精準校對原則（6 大核心守則）
📐 1. 嚴格對齊輸入量綱與單位
輸入各項數值時請務必確認量綱（例如小時、天數、金額、百分比），避免單位不匹配引發推算偏差。
🔒 2. 純前端本機毫秒級隱私保障
所有計算邏輯 100% 在您的終端瀏覽器內完成，資料絕不上傳伺服器，嚴格守護商業與個人隱私。
📊 3. 符合公認學術與產業計算模型
演算法嚴格遵循國際通用數學公式與標準計算模型，經多重情境交叉核對，數值嚴密精確。
📋 4. 一鍵複製與免登入 PDF 匯出
支援一鍵複製推算結果字串至剪貼簿，亦可直接點擊列印按鈕輸出純淨 PDF 工作報表。
🔄 5. 多情景敏感度動態對比
建議針對極端值與多組預期情景分別試算，觀察輸出數據的波動區間，輔助做出更穩健的決策。
🛡️ 6. 專業諮詢與日常參考免責聲明
本工具運算結果供日常排程、學業研習與事前參考之用，如涉及重大法規或投資決策請諮詢持證專家。