This estimator calculates the extra electricity cost associated with a tire-related EV efficiency penalty. It converts annual driving into baseline and adjusted energy use, then prices both at the entered electricity rate.
The result helps compare tire purchase choices on operating cost, especially when evaluating wider wheels, winter tires, low pressure, or high-rolling-resistance compounds. It does not include tire purchase price or maintenance.
1. Enter annual driving
Use expected miles for the period being evaluated.
2. Add baseline efficiency
Enter miles per kWh for the reference tire setup.
3. Apply a tire penalty
Estimate the percentage increase in energy needed per mile.
4. Price the electricity
Use a blended rate if charging occurs at several locations or tariffs.
5. Review added cost
The headline isolates the annual cost attributed to the tire penalty.
Percent inputs are converted to decimals. The rate is dollars per kilowatt-hour.
The result is the incremental annual electricity expense caused by the modeled tire efficiency penalty.
Charging prices, seasonal efficiency, and driving conditions can change the realized cost.
Given: 12,000 miles per year, 3.5 mi/kWh, 6% tire penalty, $0.18/kWh, and 10% charging loss.
Calculation: Baseline grid energy = (12,000 / 3.5) / 0.90 = 3,809.52 kWh. Adjusted grid energy = [(12,000 / 3.5) / 0.94] / 0.90 = 4,052.68 kWh. Added cost = (4,052.68 − 3,809.52) × $0.18.
Result: The tire penalty adds about $43.77 per year.
Use the weighted average price for where you expect to charge. Public fast charging may make the cost effect larger.
No. It compares two EV tire-efficiency scenarios and does not compare the EV with a combustion vehicle.
The added cost is zero because no driving energy is consumed.
A 6% drop in miles per kWh means the same distance requires baseline energy divided by 0.94, not simply baseline energy multiplied by 1.06.
Yes. Compare the added lifetime energy cost with the purchase-price difference and expected tire life.