Reality Check · San Antonio, TX
2026 GMC Sierra EV AT4 / Denali 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 AT4 / Denali gets an estimated 397 miles on a charge, within 3% of its 410-mile rating. Summer is the harder season here: at August's 86°F average (highs near 96°F), air conditioning trims it to about 414 miles. Charging at home at Texas's average rate (15.9¢/kWh) costs about $90 a month for 38 miles a day, against $260 for a gas Sierra on Texas's gas. On San Antonio's grid (ERCOT All), about the US average, it makes 70% less CO₂ than gas.
Partly estimated. 2 of 5 temperature bands are from 117 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 410-mile rating. Each band switches to its own drives once it has 20 from 3 drivers.
October range
424mi
At San Antonio's typical October day, 71°F · 35% highway
Winter lowEstimated
396mi
January, 52°F · lows near 41°F
Home chargingEstimated
$90/mo
7.8¢ a mile at 15.9¢/kWh. Gas Sierra: $260/mo
San Antonio's grid
0.73lb CO₂/kWh
ERCOT All (EPA eGRID): about the US average, 70% less CO₂ than gas
San Antonio, season by seasonEstimated
A Sierra EV AT4 / Denali'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 396 mi
400mi
Spring Mar–May · 70°F
About its rating
421mi
Summer Jun–Aug · 84°F
About its rating
417mi
Fall Sep–Nov · 71°FNow
About its rating
419mi
A Sierra EV AT4 / Denali'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 191 mi out and back, 381 mi one way (January: 357 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
- EVgo171 in reach
- Tesla Supercharger161
- ChargePoint117
- EV Connect61
- 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 AT4 / Denali go in a San Antonio winter?
San Antonio's winters are mild: about 397 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 410-mile rating. The harder season here is summer: about 414 miles in August, with the air conditioning on.
How much does it cost to charge a Sierra EV AT4 / Denali in San Antonio?
About $90 a month at home for 38 miles a day, at Texas's average home electricity rate of 15.9¢/kWh: about 7.8¢ a mile. A gas Sierra on Texas's average gas ($3.70 a gallon) costs about $260 a month for the same driving.
Can I charge a Sierra EV AT4 / Denali on a regular 120 V outlet in San Antonio?
Not at 38 miles a day: a 120 V outlet adds only about 32 miles in 12 hours on an average day (30 in the coldest week). Plan on 240 V, which fills it from 10% in about 17 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 AT4 / Denali charged on it makes 70% less CO₂ than a gas Sierra.
Check it for your own address
Your street, your daily miles, any temperature on the knob.
Sierra EV AT4 / Denali 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.