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ガロンあたりマイル計算機
走行マイル数と使用燃料を入力して、数秒でMPGを計算。タブを使ってトリップコスト見積もり、車両比較、年間燃料費追跡、またはMPGとL/100kmの変換ができます。
Reference Table
| MPG | L/100km | km/L |
|---|
Simple Process
How It Works
Three quick steps to understand your fuel efficiency.
Enter Your Data
Input the miles you drove and the fuel you used. Switch between US gallons, UK gallons, or litres.
Get Instant Results
See your MPG, fuel efficiency rating, CO₂ output, and metric equivalents — calculated in real time.
Plan & Save
Use Trip Cost and Fuel Savings tabs to estimate costs, compare vehicles, and find out exactly how much you could save.
クイックリファレンス
ガロンあたりマイル — 参照表
一般的なMPG値とそのL/100kmおよびkm/L換算値、および効率評価の一覧。
ブログから
燃費効率ガイド
MPG vs L/100km: Which Fuel Economy Metric Is Better?
A clear comparison of miles per gallon and liters per 100 kilometers — understanding both metrics and when to use each.
Tips & Tricks10 Proven Ways to Improve Your Car's Fuel Economy
Simple, science-backed tips to squeeze more miles out of every gallon — from tire pressure to driving habits.
Fuel BasicsWhat Is MPG and Why Does It Matter?
Learn what miles per gallon means, how it's calculated, and why fuel efficiency matters for your wallet and the environment.
Got Questions?
Frequently Asked Questions
Miles per gallon (MPG) is a measure of fuel efficiency — how many miles your vehicle travels on one gallon of fuel. Higher MPG means better fuel economy and lower fuel costs.
Divide the miles driven by the gallons of fuel used. For example, if you drove 300 miles and used 10 gallons, your MPG is 300 ÷ 10 = 30 MPG.
Generally, 30+ MPG is considered good for a combined city/highway average. Compact cars often achieve 35–45 MPG, while larger SUVs and trucks typically range from 15–25 MPG. Hybrids can exceed 50 MPG.
Use the formula: L/100km = 235.214 ÷ MPG. For example, 30 MPG ≈ 7.84 L/100km. Our converter tab does this automatically.
No. UK gallons (Imperial gallons) are larger than US gallons. 1 UK gallon = 1.20095 US gallons. A car rated at 40 UK MPG is approximately 33.3 US MPG.
It depends on your annual mileage and gas price. At 15,000 miles/year and $3.50/gallon, improving from 25 to 26 MPG saves about $81/year. Use our Fuel Savings calculator to find your exact savings.
Key ways include: maintaining proper tire pressure, removing excess weight, using cruise control on highways, avoiding rapid acceleration/braking, keeping up with engine maintenance, and using the recommended motor oil grade.
The average new car sold in the US achieves around 26–28 MPG combined. The EPA tracks this — fuel economy has improved significantly over the past two decades from around 20 MPG in 2000.