Which fuel is really cheapest for your vehicle?
The cheapest number on the price board is not automatically the cheapest energy for a journey. Consumption, usable energy, conversion cost and vehicle compatibility must be included in the same calculation.
Use cost per 100 kilometres
Multiply the real consumption in litres per 100 km by the local price per litre. For electricity, multiply kWh per 100 km by the applicable home or public-charging tariff. Use your own seasonal consumption where possible; brochure figures are useful for comparison but not a guarantee.
Standard and premium grades
A premium petrol or diesel may contain a different additive package, but a higher price does not automatically produce enough lower consumption to pay back the difference. Follow the minimum specification in the handbook. If the manufacturer requires a particular octane or standard, compatibility comes before price.
Ethanol and LPG need a complete calculation
A lower litre price can be offset by higher volume consumption. Include conversion equipment, servicing, reduced boot space where relevant and the availability of compatible stations on normal routes. A conversion must be approved for the exact vehicle and local rules.
Choosing between powertrains
Annual distance alone is not enough. Consider purchase price, maintenance, insurance, access restrictions, depreciation and where the vehicle can refuel or charge. For frequent short urban trips, cold-engine consumption can change the result significantly.
Never guess compatibility
Check the fuel flap, owner’s manual and manufacturer documentation. Karburo can compare prices for a selected grade; it cannot certify that a fuel, additive or conversion is suitable for a specific engine. When the documents disagree, ask the manufacturer or a qualified professional.
Frequently asked questions
Is the cheapest fuel per litre always cheapest per kilometre?
No. Compare price multiplied by real consumption, then include conversion and access costs.
Can Karburo confirm E10, E85 or LPG compatibility?
No. Vehicle documentation and manufacturer approval are the authoritative references.