Electric Vehicle Buying Guide: Range Is One Variable

What the range number is

The EPA figure on a window sticker is not a lab maximum and it is not a marketing estimate. EPA’s published methodology describes driving “a vehicle with a fully charged battery…continuously over the EPA city cycle until the battery is depleted,” repeating for highway, then applying “a factor of 0.7 to adjust all the test parameters, including range” to account for air conditioning, cold temperatures and aggressive driving.

Two consequences matter for anyone using an electric vehicle buying guide. First, the number already has a real-world haircut built in, which is why careful drivers frequently exceed it. Second, EPA and WLTP figures are produced by different procedures with different adjustments, so they are not convertible — a car quoted higher under WLTP is not a better car, it is a differently measured one.

The combined figure is also a weighted blend: “55% and 45%, respectively, to determine the combined city and highway driving range.” If your driving is overwhelmingly highway, the combined number overstates what you will see, because electric vehicles are least efficient at sustained high speed — the reverse of the pattern combustion drivers are used to.

Efficiency beats battery size

Range is capacity multiplied by efficiency, and only one of those two costs you money to carry around. Compare miles per kilowatt-hour rather than pack size.

Work an example. A 100 kWh pack at 3 miles per kWh delivers 300 miles. A 75 kWh pack at 4 miles per kWh delivers the same 300 miles — using 25% less energy to do it. The second car costs a quarter less to charge for every mile of its life, charges to full faster from the same power source, and carries less weight.

Efficiency is the spec that compounds. It sets your running cost, your effective range in bad conditions, and how much charging time a trip needs. Battery size only sets the ceiling.

Charging access is the real variable

This table reorders the whole purchase. Someone who charges at home overnight almost never uses public infrastructure and can happily own a shorter-range car. Someone parking on the street lives on the public network, where reliability and charging speed matter far more than the sticker range. Answer this question before comparing any two cars.

Cold weather and the honest derate

Cold reduces range through two mechanisms: the battery chemistry itself is less willing, and cabin heating draws real power that a combustion car gets free from waste heat. Expect a meaningful reduction in deep cold, and expect slower fast charging until the pack warms.

Two features materially change the winter experience. A heat pump is far more efficient than resistive heating for cabin warmth. Battery preconditioning — warming the pack en route to a fast charger, usually triggered by the navigation system — is the difference between a fast charging stop and a slow one in winter. Check whether preconditioning happens automatically or requires the driver to remember.

Precondition the cabin while still plugged in at home, too. Heating from the wall rather than the pack is free range.

Battery warranty and degradation

Read the battery warranty as carefully as the specification. The terms that matter are the years and mileage covered, the capacity threshold below which a claim is valid, whether the warranty transfers to a second owner, and what maintenance conditions could void it.

Capacity loss is normal and mostly front-loaded: a few percent in the first year or two, then a much flatter curve. What accelerates it is heat and habitual fast charging to a very high state of charge. Cars with active liquid thermal management age better than passively cooled packs, which is a design detail worth checking in an electric vehicle buying guide rather than assuming.

Total cost over the ownership period

Compare over the years you will keep it, and include energy at your actual rate, servicing, insurance, any incentives, and resale value. Home overnight energy is dramatically cheaper per mile than public fast charging — often by a factor of two or three — which is why the charging-access question drives cost as much as it drives convenience.

Insurance and depreciation are the two line items most often underestimated. Get an actual insurance quote for the specific model before committing, because repair costs and parts availability vary far more between electric models than between combustion ones.

The checklist

• Answer the charging-access question first. It reorders everything else.
• Compare miles per kWh, not battery capacity.
• Never compare EPA figures against WLTP figures. Different procedures, different adjustments.
• Check for a heat pump and automatic preconditioning if you live somewhere cold.
• Read the battery warranty for capacity threshold and transferability.
• Get a real insurance quote for the exact model before signing.

Worked in that order, an electric vehicle buying guide narrows quickly and rarely lands on the car with the biggest number on the specification sheet — because that number is a weighted, adjusted average of two laboratory cycles, and none of your driving is a laboratory cycle. An electric vehicle buying guide that repeats it without that context has repeated a test result as though it were a promise.