Reality Check · New Haven, CT
2026 GMC Sierra EV AT4 / Denali in New Haven, CT
Winter range, charging cost and how far it goes, worked out for New Haven's weather, grid and prices.
New Haven's winters are cool rather than cold: on a typical January day (31°F) a Sierra EV AT4 / Denali gets an estimated 343 miles, 16% under its 410-mile rating, about the same as in the coldest week (around January 20, when it averages 30°F). By June it's back to about 419. Charging at home at Connecticut's average rate (24.2¢/kWh) costs about $146 a month for 38 miles a day, against $298 for a gas Sierra on New England's gas. And New Haven's grid (NPCC New England), 30% cleaner than the US average, makes it 76% 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 rangeEstimated
401mi
At New Haven's typical October day, 55°F · 35% highway
Winter lowEstimated
341mi
January, 31°F · lows near 22°F
Home chargingEstimated
$146/mo
12.6¢ a mile at 24.2¢/kWh. Gas Sierra: $298/mo
New Haven's grid
0.54lb CO₂/kWh
NPCC New England (EPA eGRID): 30% cleaner than the US, 76% less CO₂ than gas
New Haven, 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 · 33°F
14% below its 410-mile rating · coldest week 341 mi
352mi
Spring Mar–May · 49°F
5% below its rating
390mi
Summer Jun–Aug · 72°F
3% above its rating
424mi
Fall Sep–Nov · 55°FNow
About its rating
401mi
A Sierra EV AT4 / Denali's range through a New Haven yearEstimated
Each month at New Haven's 30-year normal temperature, 35% highway. 43 days a year average below freezing.
How far it goes from New Haven, on real roadsEstimated
In October, from a full charge with 10% in reserve: about 180 mi out and back, 360 mi one way (January: 309 mi). Dots are DC fast chargers by network.
Fast charging around New Haven
PlugLog's map of every public charger. Tesla-only Superchargers aren't counted.
- 60DC fast chargers within 25 mi
- 0.8 mito the nearest
- ChargePoint392 in reach
- Tesla Supercharger230
- EVgo183
- Electrify America115
- EV Connect83
Road trips in October, about, by road: Harrisburg (274 mi) and Syracuse (254 mi) one way on a charge.
Questions New Haven drivers ask
How far can a Sierra EV AT4 / Denali go in a New Haven winter?
About 343 miles on a typical January day (31°F) and about the same in the coldest week of the year (around January 20, 30°F on average), estimated from real EV drives at those temperatures. That's 16% below its 410-mile rating, mostly from heating the cabin and the battery. New Haven averages 43 days a year below freezing.
How much does it cost to charge a Sierra EV AT4 / Denali in New Haven?
About $146 a month at home for 38 miles a day, at Connecticut's average home electricity rate of 24.2¢/kWh: about 12.6¢ a mile. A gas Sierra on New England's average gas ($4.25 a gallon) costs about $298 a month for the same driving.
Can I charge a Sierra EV AT4 / Denali on a regular 120 V outlet in New Haven?
Not at 38 miles a day: a 120 V outlet adds only about 30 miles in 12 hours on an average day (26 in the coldest week). Plan on 240 V, which fills it from 10% in about 17 hours.
Is it greener to drive electric on New Haven's grid?
Yes, more than most places. New Haven's grid (NPCC New England) is 30% cleaner than the US average, so a Sierra EV AT4 / Denali charged on it makes 76% 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 New Haven
Sources: temperatures, 30-year normals (NOAA 1991–2020) at New Haven Tweed Airport, CT; home electricity, EIA (Connecticut, July 2026); gas, EIA weekly (New England); 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.