With petrol now at ৳125 per litre and CNG at ৳43 per kg, the financial case for alternative fuels in Bangladesh has never been stronger. But the raw price at the pump is only half the story — fuel economy, conversion kit costs, engine wear, and refuelling convenience all affect the real total cost of ownership. This guide breaks down every factor so you can make a genuinely informed decision about which fuel makes sense for your car and your driving pattern.
Current Fuel Prices in Bangladesh (June 2026)
Bangladesh Pump Prices — June 2026
| Fuel Type | Price | Unit | Authority |
|---|---|---|---|
| CNG (Compressed Natural Gas) | ৳43 | per kg | RPGCL / BPC |
| Auto LPG | ৳80 | per litre | Market rate |
| Auto LPG (by weight) | ৳148 | per kg | LPG density 0.54 kg/L |
| Octane (95) | ৳130 | per litre | BPC |
| Petrol (Unleaded 91) | ৳125 | per litre | BPC |
| Diesel | ৳109 | per litre | BPC |
Note
CNG is sold by weight (kg) because gas volume varies with temperature and pressure. LPG is sold by litre at auto LPG stations but by kg in cylinders. These prices are Bangladesh Petroleum Corporation (BPC) and RPGCL approved rates effective June 2026.
Per-km Fuel Cost Calculation
To compare fairly, we need to convert each fuel's price into cost per kilometre driven. This requires knowing each fuel's typical fuel economy for the same car — a mid-size CNG-converted sedan (e.g. Toyota Corolla or similar).
Cost per km = Fuel Price ÷ Fuel Economy CNG example: Fuel economy: 18 km/kg (typical for a 1.3L–1.6L CNG sedan) Price: ৳43/kg Cost per km = 43 ÷ 18 = ৳2.39/km Auto LPG example: Fuel economy: 12 km/L (LPG has lower energy density than petrol) Price: ৳80/L Cost per km = 80 ÷ 12 = ৳6.67/km Petrol example: Fuel economy: 14 km/L (same car running on petrol) Price: ৳125/L Cost per km = 125 ÷ 14 = ৳8.93/km
Per-km Fuel Cost Summary (Mid-size Sedan)
| Fuel | Fuel Economy | Price | Cost per km | Monthly Cost (2,000 km) |
|---|---|---|---|---|
| CNG | 18 km/kg | ৳43/kg | ৳2.39/km | ৳4,780 |
| Auto LPG | 12 km/L | ৳80/L | ৳6.67/km | ৳13,333 |
| Petrol (91) | 14 km/L | ৳125/L | ৳8.93/km | ৳17,857 |
| Octane (95) | 14.5 km/L | ৳130/L | ৳8.97/km | ৳17,931 |
Break-Even: How Long to Recover the CNG Kit Cost?
A CNG conversion kit costs approximately ৳45,000–৳80,000 installed in Bangladesh (sequential injection kit, BRTA-approved cylinder). The break-even point — when savings exceed the installation cost — depends on how much you drive.
Monthly saving (CNG vs petrol): Petrol cost: ৳8.93/km × 2,000 km = ৳17,857 CNG cost: ৳2.39/km × 2,000 km = ৳4,780 Monthly saving = ৳17,857 − ৳4,780 = ৳13,077 Break-even (৳60,000 kit): Months to break even = ৳60,000 ÷ ৳13,077 = 4.6 months Annual saving after break-even: ৳13,077 × 12 = ৳1,56,924 Break-even (৳80,000 kit): Months to break even = ৳80,000 ÷ ৳13,077 = 6.1 months
CNG Disadvantages to Factor In
- Range reduction: A standard 60-litre CNG cylinder holds ~13 kg of gas, giving roughly 230 km range — less than a full petrol tank. You must plan refuelling more carefully.
- Boot space loss: The cylinder takes up significant boot space (especially in sedans). Sequential-injection kits with rear-mounted cylinders are better but still reduce luggage capacity.
- Station availability: CNG stations are well distributed in Dhaka, Chittagong, and Sylhet but sparse in rural areas and northern divisions.
- Engine maintenance: CNG burns hotter than petrol, requiring valve seat upgrades in older engines and slightly more frequent spark plug changes.
- Power loss: CNG delivers 10–15% less horsepower than petrol in the same engine due to lower energy density per unit volume.
- BRTA compliance: CNG cylinders must be tested and certified every 5 years under BRTA rules. Budget ৳3,000–৳5,000 for each re-certification.
Verdict: Which Fuel Is Right for You?
CNG vs LPG vs Petrol — Best Use Case
| Fuel | Best For | Avoid If |
|---|---|---|
| CNG | High-mileage city drivers in Dhaka/CTG, professional drivers, CNGs and auto-rickshaws | You drive mainly on highways or in rural areas without CNG stations |
| Auto LPG | Suburban drivers, vehicles with small boots, those who want petrol-like performance | You want the cheapest per-km cost — CNG is significantly cheaper |
| Petrol | Low-mileage drivers (<1,000 km/month), highway drivers, new cars under warranty | You drive more than 2,000 km/month — fuel savings easily justify conversion |
Tip
Use the CostNest CNG & LPG Calculator to enter your specific car's fuel economy, your actual monthly km, and the current local prices to get a personalised break-even date and 5-year savings projection. The calculator also lets you compare all three fuels side by side with your own numbers.