Diesel SUVs, such as the Chevrolet Suburban, GMC Yukon XL and Cadillac Escalade with GM’s 3.0-litre Duramax, deliver strong low-speed torque and noticeably better highway fuel economy than comparable gasoline V8s, making them excellent for long trips and towing. Gasoline V8s are more common, simpler to maintain, often quieter at idle and don’t require diesel exhaust fluid. For mostly city driving, the difference in economy is smaller, and gasoline or hybrid powertrains often make more sense.

Side by side

Diesel (e.g., 3.0L Duramax) Gas V8 (e.g., 5.3L / 6.2L)
Low-speed torque Excellent Very good
Highway fuel economy Better Lower
City fuel economy Modest advantage Lower
Maintenance Diesel exhaust fluid, particulate filter Simpler
Fuel availability Widely available at truck stops, less at some city stations Everywhere
Cold weather Needs winter-blend diesel No special needs

Why diesels are efficient

Diesel fuel contains more energy per gallon than gasoline, and diesel engines run at higher compression with no throttle losses, so they use less fuel — especially at steady highway speeds.

Emissions systems

Modern diesels use a particulate filter and selective catalytic reduction (SCR) with diesel exhaust fluid (DEF) to meet strict emissions rules. The 2015 Volkswagen emissions scandal damaged diesel’s reputation in the U.S., but today’s certified diesels are much cleaner than older ones.

What passengers notice

A modern diesel SUV is quiet at cruising speed, with relaxed, low-revving power. At idle, you may hear a faint diesel sound outside the vehicle.

For chauffeured trips

For long-distance trips — New York to Boston, Washington or the Poconos — a diesel’s range between fill-ups is convenient. For city work, gasoline and hybrid powertrains are common. Read long-distance car service and the 2021 Suburban redesign.