Electric bikes vs E20 petrol bikes: which one actually saves you money?

Ever since petrol pumps across India switched over to E20 — that is, petrol blended with up to 20% ethanol — I have been getting the same message roughly twice a week. Usually late at night, usually from a cousin. "Bhai, mileage gir gaya hai. Should I just buy an electric scooter or bike now?"

It is a fair question and it deserves a better answer than the two you normally get. One camp swears electric is free to run and petrol is dead. The other camp swears the battery will die in three years and you will be left holding a very expensive paperweight. Both are exaggerating, and neither of them has looked at your riding pattern, which is the only thing that actually decides this.

So let me do what I did at the dealership finance desk for six years: forget the brochures, open a spreadsheet, and see where the money actually goes. Before that, one thing needs saying, and I will keep repeating it through this piece — the honest answer is not "electric" or "petrol". The honest answer is a distance. Find out how many kilometres you ride in a month and the decision makes itself.

Ethanol carries less energy per litre than petrol does. That is not an opinion, that is chemistry. So when your pump switched to a 20% blend, your bike began burning slightly more fuel for the same distance. Real-world drop on most 100-160cc bikes I have tracked sits somewhere between 3% and 6%. On older carburetted bikes it can feel worse, closer to 6-8%, because the fuelling was never mapped for it.

Here is the part people miss: E20 did not make petrol bikes bad. A Splendor doing 60 kmpl instead of 64 kmpl is still a stupidly cheap way to travel. What E20 did was quietly shave a little off the one advantage petrol commuters were bragging about, and it arrived at exactly the moment electric two-wheelers finally got decent range and a real service network.

The other thing E20 did was make people nervous about rubber seals and fuel lines in older bikes. If your bike is BS6, relax, it is built for the blend. If it is a pre-2010 machine you ride daily, budget for a fuel line and seal check at your next service. That is a few hundred rupees, not a reason to change vehicles.

Let me use a bike almost everyone recognises: a 110-125cc commuter, on-road roughly ₹90,000, and let us be realistic and say it now returns 55 kmpl on E20 in mixed city riding rather than the 60 it managed before. At ₹105 a litre, that is about ₹1.91 per kilometre in fuel alone.

Then add the boring stuff nobody puts in their calculation. Service every 4,000-5,000 km at ₹700-1,100 a visit, so call it around ₹0.20 per km averaged out. Engine oil, chain, brake pads, air filter — a commuter ridden hard chews through maybe ₹3,000-4,000 a year in wear items. Insurance for a bike this size runs ₹1,800-3,500 depending on whether you took own-damage cover.

Round it all up honestly and a petrol commuter costs you somewhere near ₹2.25 to ₹2.40 per kilometre, all in, excluding depreciation. That is the number to hold in your head.

Take a comparable electric commuter — a decent 2.5 to 3 kWh scooter or motorcycle, on-road ₹1.25 to ₹1.45 lakh depending on state subsidy and city. That is a real ₹35,000 to ₹50,000 more than the petrol bike up front, and pretending otherwise is how people end up disappointed.

Charging is where it earns that back. A 3 kWh pack costs roughly ₹8 a unit on a domestic slab, so about ₹24 for a full charge, and realistically it gives you 75-85 km in city use once you account for a heavy right wrist and a pillion. That works out to roughly ₹0.30 per kilometre. Yes, really. It is that lopsided.

Servicing is genuinely cheaper because there is so little to service — no oil, no clutch plates, no chain if it is belt driven, brake pads that last longer thanks to regenerative braking. Budget ₹800-1,500 a year plus tyres. Insurance is broadly similar to petrol, sometimes slightly higher because the vehicle's insured value is higher.

Add it up and you are at roughly ₹0.55 to ₹0.70 per kilometre. Against ₹2.30-odd for petrol, you are saving about ₹1.60 every kilometre you ride.

This is the bit I want you to take away, because everything above is just arithmetic serving this one question. Be honest about your monthly kilometres — not what you hope to ride on weekends, what your odometer actually adds up in a boring month.

Under 300 km a month — roughly 10 km a day, a market run, a school drop, occasional office. You will save about ₹480 a month. On a ₹45,000 price premium, break-even lands somewhere past seven years, which is longer than most people keep a commuter. Buy the petrol bike. Genuinely. Buy the petrol bike, put the saved money in an FD, and stop reading comparison articles.

500 to 800 km a month — the classic Indian office commute, 20-30 km a day both ways. You save ₹800 to ₹1,300 a month, and break-even arrives in roughly three to four and a half years. This is the fence. If you charge at home and your commute is predictable, electric wins comfortably. If you park on the street with no plug point, petrol still makes more sense however good the maths looks.

Over 1,000 km a month — food delivery, sales rounds, a genuinely long commute, or you are just one of those people who rides everywhere. You save ₹1,600 or more every month and you break even inside two to two and a half years. At this usage the argument is over. Electric, and you will feel the difference in your wallet by the third month.

Over 1,500 km a month with regular 150 km-plus single stretches — this is the one exception at the top end. Charge stops start eating your day, and a petrol bike with a 12-litre tank and a pump every 40 km is simply a better tool. Highway-heavy riders stay petrol for now.

Battery replacement. This is the fear, and it is not baseless — a pack replacement out of warranty is ₹40,000 to ₹60,000 on most mainstream models. But warranties now run 3 years or 30,000-40,000 km on the battery from serious manufacturers, and the packs that are actually failing early are largely from brands that cut corners on thermal management. Buy from a company with service centres in your city and this risk shrinks a lot.

Resale. Petrol commuters have three decades of resale data behind them and hold value predictably. Electric two-wheeler resale is still finding its feet, and buyers discount hard because they cannot verify battery health. If you flip vehicles every two years, that uncertainty can quietly erase your fuel savings.

Charging reality. A plug point where you park is not a detail, it is the whole business case. Riders who depend on public chargers or carry a battery up three floors every night tend to sell within a year, whatever the running cost said.

And the small pleasant surprise: no clutch, no gears, no vibration at a signal, no engine heat cooking your right calf in May traffic. Nobody buys a commuter for joy, but the first month on an electric in city traffic does something nice to your temper.