Reality Check · San Antonio, TX
2025 GMC Sierra EV in San Antonio, TX
Winter range, charging cost and how far it goes, worked out for San Antonio's weather, grid and prices.
Winter barely touches range in San Antonio: at a typical January's 52°F, a Sierra EV gets an estimated 378 miles on a charge, within 3% of its 390-mile rating. Summer is the harder season here: at August's 86°F average (highs near 96°F), air conditioning trims it to about 359 miles. Charging at home at Texas's average rate (15.9¢/kWh) costs about $102 a month for 38 miles a day, against $268 for a gas Sierra on Texas's gas. On San Antonio's grid (ERCOT All), about the US average, it makes 67% less CO₂ than gas.
Partly estimated. 2 of 5 temperature bands are from 116 real drives of this model; the rest come from 1,548 real drives in EVs at each temperature (and Recurrent's winter study below freezing), applied to its 390-mile rating. Each band switches to its own drives once it has 20 from 3 drivers.
October range
366mi
At San Antonio's typical October day, 71°F · 35% highway
Winter lowEstimated
377mi
January, 52°F · lows near 41°F
Home chargingEstimated
$102/mo
8.8¢ a mile at 15.9¢/kWh. Gas Sierra: $268/mo
San Antonio's grid
0.73lb CO₂/kWh
ERCOT All (EPA eGRID): about the US average, 67% less CO₂ than gas
San Antonio, season by seasonEstimated
A Sierra EV's range on a full charge, averaged over each season's months (30-year normal temperatures), at 35% highway.
Winter Dec–Feb · 54°F
About its rating · coldest week 377 mi
380mi
Spring Mar–May · 70°F
5% below its rating
369mi
Summer Jun–Aug · 84°F
8% below its rating
359mi
Fall Sep–Nov · 71°FNow
5% below its rating
369mi
A Sierra EV's range through a San Antonio yearEstimated
Each month at San Antonio's 30-year normal temperature, 35% highway. No day of the year averages below freezing.
How far it goes from San Antonio, on real roads
In October, from a full charge with 10% in reserve: about 165 mi out and back, 329 mi one way (January: 340 mi). Dots are DC fast chargers by network.
Fast charging around San Antonio
PlugLog's map of every public charger. Tesla-only Superchargers aren't counted.
- 54DC fast chargers within 25 mi
- 2.8 mito the nearest
- EVgo167 in reach
- Tesla Supercharger158
- ChargePoint115
- EV Connect60
- Shell Recharge47
Road trips in October, about, by road: Dallas (316 mi) and McAllen (280 mi) one way on a charge; Oklahoma City (524 mi) with one fast stop.
Questions San Antonio drivers ask
How far can a Sierra EV go in a San Antonio winter?
San Antonio's winters are mild: about 378 miles on a typical January day (52°F) and about the same in the coldest week (around January 2, 52°F), estimated from real EV drives at those temperatures. That's within 3% of its 390-mile rating. The harder season here is summer: about 359 miles in August, with the air conditioning on.
How much does it cost to charge a Sierra EV in San Antonio?
About $102 a month at home for 38 miles a day, at Texas's average home electricity rate of 15.9¢/kWh: about 8.8¢ a mile. A gas Sierra on Texas's average gas ($3.70 a gallon) costs about $268 a month for the same driving.
Can I charge a Sierra EV on a regular 120 V outlet in San Antonio?
Not at 38 miles a day: a 120 V outlet adds only about 28 miles in 12 hours on an average day (29 in the coldest week). Plan on 240 V, which fills it from 10% in about 10 hours.
Is it greener to drive electric on San Antonio's grid?
Yes. San Antonio's grid (ERCOT All) is about the US average, and a Sierra EV charged on it makes 67% less CO₂ than a gas Sierra.
Check it for your own address
Your street, your daily miles, any temperature on the knob.
Sierra EV Reality Check near San Antonio
Sources: temperatures, 30-year normals (NOAA 1991–2020) at San Antonio International Airport, TX; home electricity, EIA (Texas, July 2026); gas, EIA weekly (Texas); grid CO₂, EPA eGRID 2023; cold-weather range, PlugLog's real drives and Recurrent's winter study (Nov 2025); chargers, Open Charge Map and PlugLog. Updated Oct 22, 2026.