Here’s a weird one: the 2026 Suburban with the 5.3L V8 got worse highway mpg than a 1999 Suburban with a 5.7L V8. Blame aerodynamics. The new ones are boxier.
Another fun fact: if you drive a Suburban at exactly 55 mph with the windows up, you might hit 22 mpg on the highway. Go 70 mph? You’ll drop to 16. Speed kills your mpg.
And here’s the kicker: the Suburban’s fuel tank holds 31 gallons. That’s enormous. At 15 mpg, you can go 465 miles on a full tank. That’s a road trip from New York to Cleveland.
But filling it up? That’s a spine-chiller. At $4 per gallon, one tank costs $124. You’ll feel it in your soul.
The Electric Elephant in the Room
Chevy has an electric Suburban coming. It’s called the GMC Hummer EV (sort of). But a proper electric Suburban? It’s in the works.
When that arrives, the mpg question becomes moot. You’ll ask about “miles per kilowatt.” And that number will be insane. Probably 2.0 miles per kWh, which is like 60 mpg.
But until then? We’re stuck with gas. And that’s okay. Because a gas Suburban is a character vehicle. It has personality. It rumbles. It drinks fuel and laughs.
