EV Charging Cost vs. Gas Fuel Cost

“Is an EV cheaper to run than a gas car?” is really two separate questions: how far will a charge take you, and how much does each mile actually cost either way? This guide connects the calculators that answer both, and the one built specifically for the apples-to-apples comparison.

First, How Far Does a Charge Actually Take You?

The EV Range Calculator multiplies an EV’s usable battery capacity by its real-world efficiency (miles per kWh) to estimate range at the current charge level. Efficiency isn’t fixed — regenerative braking can make city driving competitive with (or better than) highway efficiency, the reverse of how a gas car usually works, and a degraded battery (a normal part of aging after years of charge cycles) delivers less range from the same rated capacity.

Practical takeaway: most manufacturers recommend routine daily charging in roughly the 20%-80% range rather than always topping off to 100%, since spending extended time at either extreme is generally understood to accelerate battery degradation faster than staying in a moderate range.

Then, What Does a Gas Fill-Up Actually Cost Per Mile?

The Fuel Cost Calculator computes a trip’s fuel cost from distance, fuel economy, and fuel price — straightforward, but the inputs matter more than they seem. Highway-heavy driving gets meaningfully better fuel economy than stop-and-go city driving, and speed, load, and towing all reduce real-world economy below a vehicle’s rated figure. If the fuel economy figure itself isn’t known, the Gas Mileage calculator derives it from a real fill-up and feeds directly into this calculator.

Practical takeaway: MPG and L/100km move in opposite directions for the same efficiency — plugging an MPG number into a field expecting L/100km (or vice versa) produces a result that looks plausible but is actually meaningless.

The Comparison That Actually Answers the Question

The EV Charging Cost Calculator is built specifically for the apples-to-apples comparison: it computes charging cost per mile from battery capacity, charge added, charging efficiency (some energy is always lost as heat during charging, so 100% efficiency is never realistic), and electricity rate, then compares that directly against a gas vehicle’s own cost per mile. This is a genuinely different question from the Electricity Cost calculator, which estimates a whole household’s electric bill rather than one vehicle’s charging session.

Practical takeaway: using a flat average electricity rate instead of an actual off-peak rate can overstate the real charging cost by a meaningful margin, since many utilities charge noticeably less overnight specifically to encourage EV charging during off-peak hours — and public DC fast charging typically costs more per kWh than charging at home, so a road-trip estimate needs the charging network’s own published rate, not a home rate.

Putting It Together

Use EV Range Calculator to understand how far a given charge level actually gets an EV, use

Fuel Cost Calculator (paired with the Gas Mileage calculator if the fuel economy figure isn’t already known) to find the real per-mile cost of the gas alternative, and run EV Charging Cost Calculator for the actual side-by-side per-mile comparison, using the real electricity rate that applies to actual charging time rather than an average bill rate. This comparison is also sensitive to both the local electricity rate and the current gas price, so it’s worth rerunning periodically with up-to-date numbers rather than trusting a comparison done months or years ago — and remember that fuel/energy cost is only one line item in what a vehicle actually costs to own, not the whole picture on its own.