Thai fuel labels can be confusing at first—Gasohol 95, 91, E20, E85, Diesel/B7—plus attendants usually pump for you. Here are the most common pitfalls and quick fixes.

  1. Using the wrong fuel
  • Mistake: Filling E20 in a car that needs Gasohol 95, or petrol in a diesel.
  • Fix: Read the fuel cap and your contract, then say the grade clearly: “Gasohol 95, full” / “E20, full” / “Diesel (B7), full.” If misfueled, do not start the engine—call the rental company.
  1. Falling for E85
  • Mistake: Thinking E85 is just a cheaper petrol.
  • Fix: E85 is only for flex‑fuel cars. Unless the cap says E85/FFV, never use it.
  1. Paying extra for premium you don’t need
  • Mistake: Choosing premium blends “for better performance.”
  • Fix: Standard Gasohol 95 (or E20 if approved) is correct for most rentals. Save your money.
  1. Skipping receipts and photos
  • Mistake: No proof for a full‑to‑full return.
  • Fix: Keep the receipt and snap the pump screen (liters/baht), odometer, and fuel gauge after filling.
  1. Letting DCC inflate your bill
  • Mistake: Paying in your home currency at the terminal.
  • Fix: Always pay in THB to avoid poor conversion rates.
  1. Topping off after the first click
  • Mistake: Forcing more fuel to hit “needle at max,” risking overflow and evap‑system damage.
  • Fix: Ask for a full tank and stop at the first auto‑click. Gauges can take a minute to rise—turn the ignition off/on if needed.
  1. Not checking the pump is zeroed
  • Mistake: Starting a fill with a non‑zero display.
  • Fix: Confirm the pump shows 0.00 before it starts.
  1. Miscommunication at the pump
  • Mistake: Saying only “full” without the grade.
  • Fix: Tell them both grade and amount: “Gasohol 95, full please.” Thai phrase: “Gasohol ha‑sip‑ha (95), tem‑tang kráp/khâ.”
  1. Using roadside bottle fuel (for scooters) in cars
  • Mistake: Grabbing the cheapest bottles.
  • Fix: Only refuel at proper stations (PTT, Bangchak, PT, Shell, etc.). Bottle fuel is for motorbikes and can harm car engines.
  1. Ignoring the cap/door
  • Mistake: Driving off with a loose cap or open flap, triggering a warning light.
  • Fix: Click the cap tight and close the door; check for leaks or fuel smell.

Bonus: If your car is E20‑approved, E20 is usually a few baht per liter cheaper than Gasohol 95—safe and economical.

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