Volvo VNL 670 Vs 780 Weight: Tare & Payload Guide

If you are choosing between a Volvo VNL 670 and a Volvo VNL 780, the headline number is simple: the 780’s 77-inch condo sleeper makes it roughly 2,000 pounds heavier than the 670’s 61-inch mid-roof sleeper. A typical road-ready VNL 670 scales around 17,500–18,500 lbs with fuel and gear aboard; a comparably equipped VNL 780 scales around 19,500–21,700 lbs. Under the federal 80,000-lb gross combination limit, that difference comes straight out of your legal payload.

The short answer: VNL 670 tare (road-ready) ≈ 16,500–18,500 lbs; VNL 780 tare (road-ready) ≈ 18,500–21,700 lbs. The ~2,000-lb gap is the price of the 780’s stand-up condo sleeper — dinette workstation, upper bunk, and longer wheelbase included. If your freight grosses out near 80,000 lbs, buy the 670. If it cubes out first, or you live in the truck, the 780 earns its keep.

Table of Contents

Key Takeaways

The VNL 670 carries a 61-inch high-roof sleeper; the VNL 780 carries a 77-inch high-roof condo sleeper with a convertible dinette workstation.
Dry curb weight typically runs 16,000–17,000 lbs (670) vs 18,000–19,000 lbs (780); road-ready with fuel, APU, and gear, the gap stays near 2,000 lbs.
A published owner-operator scale ticket shows a loaded 780 at 21,680 lbs (steer 12,200 / drives 9,480) — too heavy to scale 45,000-lb reefer loads.
At the 80,000-lb federal limit, the 670 hauls roughly 2,000 lbs more paying freight than the 780 on identical trailers.
Volvo replaced the 670 with the VNL 760 (70″ sleeper) and the 780 with the VNL 860; the all-new 2024 VNL generation continues the 860 as flagship.

The Numbers, Head to Head

Both trucks share the same DNA — Volvo D13 power, I-Shift automated transmission, and Class 8 ratings — but the sleeper choice changes the weight slip. Figures below are realistic bands compiled from dealer listings, auction spec sheets, and published owner scale tickets; exact numbers move with tanks, fairings, APUs, and wheelbase.

Specification	Volvo VNL 670	Volvo VNL 780	Why It Matters
Sleeper size & type	61-inch high-roof	77-inch high-roof condo	The 780’s extra 16 inches of sleeper is the root of the weight gap
Standing interior height	~64 inches	100+ inches	Full stand-up room anywhere in the 780’s living space
Dry curb weight (typical)	16,000 – 17,000 lbs	18,000 – 19,000 lbs	Factory weight before fuel, driver, and gear
Road-ready scale weight	17,500 – 18,500 lbs	19,500 – 21,700 lbs	Full tanks, APU, DEF, driver, and personal gear aboard
Engine	Volvo D13 12.8L, 375 – 500 hp / 1,450 – 1,850 lb-ft (D16 and Cummins ISX15 on older 670s)		Same powertrain family; weight gap is cab/chassis, not engine
Transmission	Volvo I-Shift 12-speed automated (ATO2612D)		~712-lb unit; identical on both models
Front axle rating	12,000 – 12,500 lbs	12,500 – 13,200 lbs	The 780’s steer axle runs heavy — spec tires accordingly
Typical wheelbase	210 – 230 in	225 – 240 in	Longer frame rails and swing clearance add steel weight
Fuel capacity (typical)	Dual 100 – 125 gal	Dual 125 – 150 gal	300 gal of diesel ≈ 2,160 lbs — tanks are a weight strategy
Max legal combination weight	80,000 lbs (federal: 12,000 steer / 34,000 drives / 34,000 trailer tandems)		The fixed ceiling both trucks share
Replaced by	VNL 740 / 760	VNL 860	2018 generation; all-new VNL arrived for 2024

Tare Weight, Visualized

“Dry curb” is the factory truck with empty tanks; “road-ready” is what a CAT scale shows with full fuel, DEF, APU, driver, and gear. The gap barely moves between the two states — the sleeper shell is always there.

VNL 670 — dry curb (typical)16,500 lbs

16,500

VNL 670 — road-ready (typical)18,500 lbs

18,500

VNL 780 — dry curb (typical)18,750 lbs

18,750

VNL 780 — road-ready (owner scale ticket)21,680 lbs

21,680

Scale: 0 – 22,000 lbs. 670 figures are typical bands from dealer/auction listings; the 780 road-ready figure is a published owner-operator scale ticket (300 gal fuel, APU, full DEF, gear aboard). Always scale your own truck.

Where the 780’s Extra ~2,000 Lbs Actually Lives

The weight does not come from one big thing. It comes from a dozen medium things, all downstream of one decision: a condo sleeper you can stand up and live in.

Illustrative side profiles (not to scale). The 780’s taller roof, longer sleeper, and residential interior are where the weight penalty originates.

Sleeper shell and framing (largest share). Sixteen extra inches of high-roof sleeper means more stamped steel, glass, roof fairings, insulation, and trim — well over half the total delta.
The dinette workstation. The 780’s signature convertible dinette — steel-framed table, two booth seats that fold into a bed — plus upper bunk, ladder, refrigerator, microwave prep cabinet, and overhead cupboards add several hundred pounds over the 670’s fixed bunk.
Wheelbase and chassis. The 780 typically rides a 225–240-inch wheelbase (vs 210–230 for the 670) to keep swing clearance for 53-foot trailers. Longer frame rails are heavier frame rails.
Tanks and fairings. 780s are commonly spec’d with dual 125–150-gallon aluminum tanks and full chassis fairings. Three hundred gallons of diesel weighs about 2,160 lbs — fuel strategy alone can swing the scale by a ton.
APU and hotel loads. Owner-operators who live in the truck add auxiliary power units (~400 lbs), inverters, tools, and supplies. A published 780 owner ticket shows 21,680 lbs with APU, 300 gallons of fuel, full DEF, and gear aboard.

The 80,000-Lb Math: Why Every Pound Is Money

Federal law caps the combination at 80,000 lbs gross — 12,000 on the steer axle, 34,000 on the drive tandems, 34,000 on the trailer tandems. Payload is what’s left after truck, trailer, fuel, and driver:

Legal payload = 80,000 − (tractor tare + trailer tare + fuel + driver/gear)

Run that arithmetic with typical numbers. A road-ready 670 at 18,500 lbs pulling a 13,500-lb dry van with 1,500 lbs of fuel and driver leaves 46,500 lbs for freight. Behind a 21,680-lb 780, the same load leaves 43,320 lbs — a 3,180-lb swing in this fully-loaded comparison. On weight-sensitive freight — beverages, paper, canned goods, produce — brokers pay by the pound, and 2,000 lbs of denied payload is revenue you watch drive away.

There is also an axle-distribution wrinkle. That owner ticket showed the 780’s steer axle at 12,200 lbs — past the 12,000-lb federal steer figure — with the drives at only 9,480. The 780’s mass sits forward, so owners need 13,200-lb-rated steer tires and careful fifth-wheel placement to stay legal, especially on full tanks.

Scale-Check: Three Freight Scenarios

Pick the freight you actually haul. Each tab runs the empty-weight arithmetic for both trucks against the 80,000-lb ceiling so you can see exactly where each one lands.

Which Truck Scales Your Freight?

Heavy reefer: 45,000-lb load
Dry van: 42,000-lb load
Light/volume freight

Scenario: 45,000 lbs of refrigerated freight. Reefer trailer tare ≈ 15,500 lbs with a full reefer tank.

VNL 780: 21,680 (tractor) + 15,500 (reefer) = 37,180 empty → + 45,000 load = 82,180 lbs — 2,180 OVER, illegal.
VNL 670: 18,500 (tractor) + 15,500 (reefer) = 34,000 empty → + 45,000 load = 79,000 lbs — legal, 1,000 to spare.

Verdict: the 670 books this load; the 780 must refuse it or burn off fuel to get under 80,000. On weight-sensitive lanes, this is the whole ballgame.

Scenario: 42,000 lbs in a 53-ft dry van. Aluminum dry van tare ≈ 13,500 lbs.

VNL 780: 21,680 + 13,500 = 35,180 empty → + 42,000 = 77,180 lbs — legal, 2,820 headroom.
VNL 670: 18,500 + 13,500 = 32,000 empty → + 42,000 = 74,000 lbs — legal, 6,000 headroom.

Verdict: both scale it comfortably. The 670 keeps its edge on the occasional 45,000-lb van load, but at 42,000 lbs the choice is lifestyle, not the scale.

Scenario: lightweight volume freight (parcels, insulation, plastics) — the trailer cubes out long before it grosses out.

Typical cube-out loads run 20,000 – 30,000 lbs. Both trucks scale these with 15,000+ lbs to spare — tare weight is irrelevant here.

Verdict: the 780 wins on comfort. If you live in the truck weeks at a time, the stand-up condo, dinette, and double bunk pay back in driver health and retention what they cost in tare weight.

Weight, Fuel, and the Ton-Mile Reality

Heavier trucks burn more fuel — but less than most people assume. At a steady 65 mph on flat highway, an extra 2,000 lbs of tare adds only a small rolling-resistance penalty; the cost grows on grades and in stop-and-go traffic, where every acceleration drags the extra ton back up to speed.

The sharper question is revenue per trip, not MPG. If the 670 lets you accept 2,000 lbs more paying freight on every weight-sensitive load, that revenue dwarfs a small fuel difference. Conversely, if your freight never approaches the ceiling, the 780’s weight costs almost nothing while its living space keeps drivers in the seat — and driver turnover is the most expensive line item in trucking.

What Replaced the 670 and 780

Volvo retired the 670/780 numbering with the 2018 VNL generation. The 61-inch 670 was succeeded by the VNL 760 with a 70-inch high-roof sleeper (the 740 covers the mid-roof slot), and the 780 was supplanted by the VNL 860 flagship condo. The all-new 2024 VNL generation continues the 860 as the premium long-haul model with a redesigned 74-inch sleeper. The same physics applies: the bigger the house, the heavier the tare.

Frequently Asked Questions

What is the tare weight of a Volvo VNL 780?

A typical VNL 780 dry curb weight runs 18,000–19,000 lbs depending on spec. Road-ready with full fuel tanks, a full DEF tank, an APU, the driver, and gear, published owner scale tickets show 20,000–21,700 lbs — one documented ticket weighed 21,680 lbs with 300 gallons of fuel aboard. Always scale your own truck; tanks, fairings, and wheelbase move the number by hundreds of pounds.

How much heavier is the VNL 780 than the VNL 670?

Roughly 2,000 lbs in equivalent spec. The gap comes from the 780’s 77-inch high-roof condo sleeper (versus the 670’s 61-inch sleeper): a taller, longer shell with more steel, glass, and insulation, plus the convertible dinette workstation, upper bunk, refrigerator, and cabinetry, and typically a longer wheelbase with larger fuel tanks.

Can a Volvo VNL 780 legally haul 45,000 lbs?

Usually not with a refrigerated trailer. A road-ready 780 (~21,680 lbs) plus a 15,500-lb reefer leaves only about 42,800 lbs under the 80,000-lb federal limit — and one owner’s ticket notes they cannot scale 45,000-lb loads, capping at 44,000. A lighter-spec’d 670 (~18,500 lbs road-ready) leaves about 46,000 lbs, so it can take 45,000-lb loads legally. With a lighter dry van, the 780’s ceiling rises into the 44,000–45,000-lb range.

What replaced the Volvo VNL 670 and 780?

In the 2018 VNL generation, the 670 was replaced by the VNL 760 (70-inch high-roof sleeper, with the 740 covering mid-roof), and the 780 was replaced by the VNL 860 flagship condo. The all-new 2024 VNL lineup continues the 860 as the premium long-haul model with a redesigned 74-inch sleeper.

Does the 780’s extra weight hurt fuel economy?

Modestly, and mostly where you’d expect: steady highway cruising sees only a small rolling-resistance penalty from an extra ton, while grades and stop-and-go traffic cost more. For most operators the bigger economic factor is payload, not MPG — the 670’s ~2,000-lb weight advantage converts directly into paying freight on weight-sensitive loads, which outweighs any fuel difference.

Bottom line: this is a business-model debate. If your freight is heavy and margins live at the scale house, the 670’s ~2,000-lb advantage is pure revenue. If your freight is light, your runs are long, and the cab is home, the 780’s condo is the most productive office-with-a-bedroom in trucking. Scale your truck, know your freight, and pick the sleeper that pays.