Mercedes-Benz GLS vs. EQS SUV: Gas or Electric Three-Row Luxury?

A question comes up on our showroom floor in some form again and again. Same footprint, same badge, same want for three rows of premium space, so why do these two feel so different once you live with one? Here’s where we’d start.

The 2026 GLS is a known, refined quantity. Seven real seats, a 3.0-liter mild-hybrid inline-six, and the freedom to stop for fuel anywhere in Texas. The 2026 EQS SUV is a different proposition altogether, whisper-quiet, instantly torquey, and electric, and it’ll reshape how you think about refueling. Neither one is a compromise. They’re not interchangeable either, and which one fits you depends almost entirely on how you use those three rows and whether your garage has a 240-volt outlet.

How Far Will the EQS SUV Actually Go Here?

The EPA rates the 2026 EQS 400 4MATIC^® SUV at 312 miles of range on a full charge, and in North Texas that number behaves reasonably well, though you’ll want to temper it for highway speed and August heat before you lean on the last few miles. You won’t hit 312 miles at 75 mph on I-35 with the cabin cooled to 68 degrees in August, but you won’t fall dramatically short either. The heat pump that Mercedes-Benz includes as standard equipment on the EQS SUV manages cabin climate more efficiently than a resistive heater, and Texas summers are kinder to lithium-ion batteries than a Minnesota winter. What we see along the Dallas North Tollway corridor stays consistent, and owners who charge at home nightly rarely touch public charging for anything beyond road trips, so daily range anxiety just doesn’t show up.

That said, the picture changes on highway legs. The table lays it out.

The GLS 450’s 23.8-gallon tank and EPA-rated 21 mpg combined add up to real driving range north of 500 miles before a stop. The EQS SUV’s 312-mile EPA figure holds for mixed driving, but plan on roughly 240 to 260 miles once you’re sustaining 70-plus mph on a highway run with a full cabin.

Where Do You Charge Locally in DFW?

Where you charge is the question that actually decides this purchase, not the EPA sticker, and in the Plano and Frisco area we find owners settle into one of two patterns once the EQS SUV is in the garage. Our team at Mercedes-Benz of Plano can walk you through the full charging setup. The first pattern is the home wallbox. They install a 240-volt Level 2 unit and stop thinking about public charging for daily driving, since at roughly 30 miles of range added per hour a depleted 118-kWh battery returns to full overnight without effort. The second pattern is the occasional road trip, where the 2026 EQS SUV’s standard NACS DC fast-charging adapter earns its keep.

• Confirm your home garage has a 240-volt circuit, or budget for installation before delivery
• Register the NACS adapter toggle in the Mercedes-Benz app before your first road trip
• Use the in-vehicle Navigation with Electric Intelligence to pre-plan charging stops on any leg over 200 miles
• Set a departure charge time to take advantage of off-peak electricity rates
• Note that the NACS adapter is for DC fast charging only, not compatible with Level 2 AC home wallboxes

Browse our current EQS SUV and GLS inventory to confirm available configurations.

The Third Row: What the Numbers Actually Mean

The third row is where the tradeoff truly lives, and most comparisons breeze right past it, so we’ll put the tape measure up front, because the GLS 450’s third row carries 34.6 inches of legroom and the EQS SUV’s optional third row runs about 28.7 inches. Six inches sounds modest. For a real adult on a two-hour drive to Fort Worth or a run to DFW Airport, it’s the difference between a usable seat and a seat that works for kids and short hops only. Mercedes-Benz built the EQS SUV on a dedicated electric platform that lays the battery pack flat beneath the floor, and that one decision does wonders for the second row while it compresses the third. The GLS is a purpose-built three-row SUV, and the dimensions say so.

Folding the EQS SUV’s third row flat is easy, but you’ll want to slide the second row forward first to clear the headrests, a two-second move you only learn after the first try. We point it out on the lot so nobody wrestles with it in a parking garage later.

With all three rows in use, the GLS holds 17.4 cubic feet behind the third seat and the EQS SUV holds 7 cubic feet in the same configuration. For a family heading to a youth sports tournament with gear, that difference lands right away. Fold everything down and the gap narrows a good bit (84.7 versus 74 cubic feet), though day-to-day three-row use is where the GLS earns its footprint.

If you’re considering downsizing to a two-row configuration, the GLE presents a distinct alternative worth weighing alongside these two.

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Plan It This Way: Matching the Right Vehicle to Your Actual Routine

The EQS SUV makes the most sense for a household with a dedicated home charger, a Legacy West or Frisco-corridor daily commute, and occasional rather than habitual seven-passenger use. The whisper-quiet cabin, the full-width MBUX Hyperscreen, the 590 lb-ft of immediate torque, and the near-elimination of fuel stops are real and daily. Its third row is backup seating, plain and simple. Treat it that way and you won’t be let down.

The GLS 450 makes the most sense when the third row is in regular rotation, when the family takes annual road trips where charging infrastructure is uncertain, or when a 7,700-pound tow rating is part of the picture. The EPA-rated 21 mpg combined is reasonable for the segment. Its cabin refinement holds across all three rows in a way that makes a long drive to Amarillo or a full-family airport run feel effortless instead of calculated.

We’ve got customers in the Legacy corridor who live in the EQS SUV and never look back, not once. We’ve also got customers who tried it, loved everything about it, and simply needed steadier third-row space for their actual family rhythm, so they chose the GLS. Both calls are correct.

Does the EQS SUV really seat seven adults comfortably?

Third-row legroom in the 2026 EQS SUV measures approximately 28.7 inches. That’s workable for children and younger teenagers, and manageable for adults on short trips of under 20 minutes. For regular adult use on longer drives, the GLS 450 is the better answer, since its third row offers 34.6 inches of legroom and is a more purposeful seat in a vehicle engineered around three-row capacity from the outset.

How does North Texas heat affect the EQS SUV’s range?

Heat is a gentler battery stressor than cold. The EQS SUV includes a standard heat pump that handles cabin cooling more efficiently than resistive heating, and warm-weather battery chemistry generally performs close to the EPA estimate. The more meaningful variable in DFW is sustained highway speed, so expect roughly 240 to 260 miles at 70-plus mph versus the EPA’s 312-mile rating in mixed driving. The GLS carries no range variable. Its EPA-rated 21 mpg combined holds whether it’s July or January.

What is the charging situation for a Dallas-area EQS SUV owner day to day?

Most owners in this market cover their daily routine on a 240-volt Level 2 home wallbox, which adds roughly 30 miles of range per hour and returns a full charge overnight. The 2026 EQS SUV includes a standard NACS DC fast-charging adapter that opens both the Tesla Supercharger network and the Mercedes-Benz MB.CHARGE Public stations for road trips. At a 200-kW DC fast charger, a 10-to-80-percent session takes roughly 31 minutes, a practical stop on a Houston or Austin run.