Automotive · 🇰🇷 Korea
Korean Real-world Fuel Economy Calculator
Real-world Korean fuel economy with Opinet gasoline price and monthly cost forecast.
About this tool
Korean Fuel Economy Calculator turns a fuel-up record (liters / km / price per liter) into real-world km/L, won per 100 km, and monthly/annual fuel cost. Works for gasoline, diesel, and LPG; suggests Opinet daily average prices as a reference; compares against the manufacturer's rated economy with a deviation %. Multiple fuel-ups roll up into a trend chart. All records sit in the browser's localStorage. For LPG (lower energy density than gasoline), the won-per-100 km card gives a fairer cost comparison than km/L.
Use cases
Scenario 1
Rated vs real — vehicle efficiency
For a 14 km/L rated car, check whether real km/L sits inside the typical −10 to −25% range.
Scenario 2
Monthly fuel forecast
Project monthly and annual fuel cost from your typical mileage × current Opinet average.
Scenario 3
Gasoline / diesel / LPG
Comparing gasoline / diesel / LPG variants of the same model? Use the won/100 km card to compare real cost.
Scenario 4
Commute — pre-purchase check
For a 60 km round-trip commute, simulate monthly fuel cost across candidate vehicles before buying.
Scenario 5
Trend chart — efficiency drop
Track 5–10 recent fuel-ups to spot efficiency drops that signal a service visit.
Features
- Gasoline / diesel / LPG support
- Opinet daily average suggested
- Deviation % vs rated economy
- Cost per 100 km + monthly / annual forecast
- Fuel-up trend chart
- localStorage-only, fully in-browser
Frequently asked
- Q. Why is real km/L lower than rated?
- A. Rated values come from standardized cycles; real driving (accel, idling, AC, payload) typically lowers efficiency 10–25%.
- Q. Can I compute km/L only?
- A. Yes — leave price blank for km/L only; the cost card disables.
- Q. Is LPG supported?
- A. Yes. LPG energy density is ~72% of gasoline, so km/L looks low — use the won/100 km card for fair cost comparison.
- Q. Where are records stored?
- A. localStorage only — no cross-device sync, no server backup. Cache clearing wipes them.
- Q. Is this an Opinet / Ministry of Environment tool?
- A. No. Opinet / Ministry of Environment are independent; this is an unaffiliated calculator. Confirm prices on Opinet's official page.
Sources / references
Related guides / blog posts
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How we run it / disclaimer
This tool is advisory and does not constitute legal, tax, medical, or financial advice. All calculations and document generation run in your browser; inputs are never sent to a server. Ads follow Google AdSense policy and are kept separate from tool accuracy.