Live demos · calculator
Could a more efficient car save you real money?
Punch in your tank, how often you fill it, and your car's L/100km — then drop the efficiency to see what you'd save with a more economical vehicle. Uses live South African diesel 50ppm prices (Highveld: R31.38/L).
Live · R31.38/L
Your tank
What you actually burn each month
L
×
Litres per month200 L
Cost per refillR1 569
Cost per monthR6 276
Your car · vs a more efficient one
Where could you spend less?
L/100 km
New vehicle
L/100 km
Implied driving2 000 km / month
Same distance on new car140 L / month
That's about2.8 fills/month
Quick "new car" presets:
Your saving
Switching to a 7.0 L/100 km vehicle would save you…
Per month
R1 883
R6 276 → R4 393
Per year
R22 594
R75 312 → R52 718
Over 5 years
R112 968
flat pricing assumption
Assumes you drive 2 000 km a month at 10.0 L/100 km, and that diesel 50ppm stays at the current R31.38/L (Highveld pump). Five-year totals don't compound for fuel-price inflation — they only show the efficiency-driven saving.
Payback
Fuel savings pay back the upfront cost in 11 y 1 mo
R
Today60 months
> 5 yrs
Pays back
11 y 1 mo
break-even Jun 2037
5-year net
R-137 032
R112 968 saved − R250 000 capex
After payback
—
doesn't break even within 5 years
Treats the upfront cost as a single capital outlay you recover from the fuel-saving stream. Doesn't model trade-in value, financing interest, maintenance differences, or future fuel-price inflation — those swing the answer significantly. Use it as a sniff-test, not a quote.
Use a preset for your current vehicle: