Petrol pumps in India
Demand ÷ capacity — the canonical infrastructure build.
Estimate the number of petrol pumps (fuel stations) in India. Infrastructure guesstimates almost always resolve as total demand ÷ capacity per unit: fuel consumed nationally ÷ what one station can viably sell.
Fleet
Registered-and-active: ~250M two-wheelers, ~60M cars, ~28M commercial vehicles (trucks, buses, LCVs).
Fuel per vehicle
2W ~0.6 L/day, cars ~1.5 L/day, commercial ~12 L/day (they run all day — this is the term beginners underweight).
National demand
150 + 90 + 340 ≈ ~580M litres/day.
Station viability
A station needs ~6,000–7,000 L/day blended to survive (urban much higher, highway/rural lower).
Count
580M ÷ 6,500 ≈ ~90,000 pumps.
How to defend it
The insight to volunteer: commercial vehicles consume more fuel than all private vehicles combined despite being ~8% of the fleet. Interviewers reward the candidate who weights by usage intensity, not vehicle count.