What an E-Bike Costs to Run

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Here is the headline, and it is the whole answer: at the US average residential electricity price, filling the biggest battery in this comparison costs $0.117 — about twelve cents — and riding a mile costs 0.17¢. A thousand miles of e-biking costs $1.68. The same thousand miles in the average new American car costs $141.73 in fuel alone.

That’s a factor of about 84. It is such a large number that the interesting question stops being “does an e-bike save money on energy” and becomes “why is nobody in this category doing the division?” We checked: the big e-bike publishers test dozens of bikes a year, run dynamometers, and never once publish a cost per mile. So here it is, with the working shown, so you can disagree with the inputs rather than with us.

The inputs, and exactly where each one came from

There are only three, and none of them is ours.

1. The electricity price: 18.8¢ per kilowatt-hour. That is the US residential sector average for April 2026 — the most recent month published — from the EIA’s Electric Power Monthly, Table 5.3, retrieved on 17 July 2026. Not “about 17 cents” from memory. The actual published figure, so you can re-run this with your own tariff and land somewhere sensible.

2. The battery capacity:quoted from each seller’s own live Amazon listing. The Heybike Mars 2.0 listing says “624WH Removable Battery”. We have not measured a pack, opened one, or checked whether it holds what it says. This is the seller’s claim, dated, and every number downstream inherits whatever is wrong with it.

3. The claimed range:also the seller’s. “70+Miles Long Range”. This is the weakest input on the page by a distance, and we want to be blunt about why: a claimed range is a marketing number produced under conditions the manufacturer chose and did not publish. No rider weight. No assist level. No gradient. No wind. No temperature. It is not a lie — it is a best case, and a best case is what you get from a light rider on the lowest assist setting on flat ground on a warm day. You will not ride in that.

The arithmetic, in full

Take the top pick from our Amazon roundup, the Heybike Mars 2.0, whose listing claims a 624Wh battery and 70+ miles.

Step 1 — watt-hours to kilowatt-hours. Energy is billed in kilowatt-hours, so divide by 1,000. 624 ÷ 1,000 = 0.624 kWh. That is the entire capacity of the battery: less than two thirds of one unit of electricity.

Step 2 — cost of a full charge. Multiply by the price of a unit. 0.624 kWh × 18.8¢/kWh = $0.117. Roughly twelve cents to fill the biggest battery here from empty.

Step 3 — cost per mile. Divide the charge by the claimed range. $0.117 ÷ 70 miles = 0.17¢ per mile. Less than a fifth of one cent.

Step 4 — a distance that means something. A 10-mile round-trip commute, five days a week, is 50 miles a week and about 2,500 miles a year. On this bike, on this electricity price, at this claimed range, that year of commuting costs $4.20 of electricity. The same 2,500 miles in the average new car costs $354.32 in petrol, and that is before insurance, parking, tyres, servicing or depreciation.

Now break it. Suppose the range claim is twice as optimistic as reality and you really get 35 miles. Then the cost per mile doubles to about 0.34¢ and the commuting year costs about $8.39. Still nothing. That is the actual finding of this page:the conclusion is so robust that the weakest input can be wrong by 100% and it doesn’t change the decision. Which is exactly why the arithmetic is worth publishing even though the inputs are imperfect — and exactly why nobody should be selling you an e-bike on its electricity bill.

The tell: everybody claims about nine watt-hours a mile

Look at the “implied Wh/mile” column in the table. It’s just the battery divided by the claimed range, and it is the one number on this page that no seller prints and every seller implies. Heybike’s Mars claims 8.9. The Ranger claims 10.0. The Cityscape, 9.4. The Vivi, 10.0. The Jasion, 9.0.

Five different brands, five different batteries, five different bikes — and a spread of about one watt-hour per mile. Uniformity like that is not the sound of five companies measuring; it’s the sound of five marketing departments dividing.These bikes differ in wheel size, tyre width, weight and motor by enormous margins. Their claimed efficiency is nearly identical. Whatever produced those range figures, it wasn’t five independent tests.

What’s the real number? We don’t know, and we’re not going to make one up.We have no dynamometer, no test bikes and no published dataset for these specific machines. What we can tell you is that consumption rises with your weight, your speed, the hills, the cold, your tyre pressure and how much you lean on the throttle — and that if a listing quotes one number with no conditions attached, it has told you about its best day, not your average one. That’s the subject of e-bike battery range explained and how far can an e-bike really go.

What this page deliberately doesn’t include

Charging losses. The figures above are the energy that ends up in the pack. A charger is not 100% efficient — some of what your meter records becomes heat in the brick. Every other site that discusses this reaches for “about 85%”. None of these manufacturers publishes an efficiency figure for its charger, so applying one would mean inventing the number that changes the answer. We’ve left it out and told you it’s missing. Your real bill is somewhat higher than the table, and “somewhat higher” than a fifth of a cent is still nothing.

Battery degradation.Lithium packs lose capacity with cycles and with age, which means the cost per mile slowly rises over the bike’s life. Not one seller in this catalogue publishes a cycle-life figure. We cannot model what nobody publishes.

The battery replacement.This is the big one, and it’s in the buyer’s guide below — because the electricity genuinely is free-ish, and the pack genuinely is not.