Compare Mowers
List prices are the manufacturer’s published figures, re-checked daily; they exclude tax, freight and dealer setup.
A side-by-side reference of each model's stated specifications. MowerFacts doesn’t give opinions: where a published, spec-derived rule can separate machines we mark a Data Pick and show the rule; here, read the values and decide what fits your needs.
Best suited for
What each model is built for, from its duty class and key specs. This is a neutral reference — MowerFacts does not rank one model above another.
- Wright Autonomous ZK 61 61G8 — commercial: daily paid use and high acreage; 61-inch deck; gas powered
- Spartan Spartan KGZ-XD — commercial: daily paid use and high acreage; 61-inch deck; gas powered
What’s different? The 5 differences that matter most, from the published figures.
- Autonomous ZK 61 61G8 uses a Briggs & Stratton engine; Spartan KGZ-XD uses a Vanguard engine. The engine maker builds the engine; the mower maker chooses the model, rating and fit, so the badge alone does not settle output or longevity.
- Autonomous ZK 61 61G8 has a Floating-Mulch deck; Spartan KGZ-XD has a 6" Deep, Reinforced 7 Gauge Full-Floating Deck deck.
- Autonomous ZK 61 61G8 has a published top speed of 12.5 mph; Spartan KGZ-XD has a published top speed of 15 mph, a 2.5 mph difference. Top speed is the maker's maximum in transport. Mowing speed is lower and depends on grass, terrain and the deck.
- Autonomous ZK 61 61G8 cuts from 1.5 in (38 mm) to 5.5 in (140 mm); Spartan KGZ-XD cuts from 1.5 in (38 mm) to 4.8 in (121 mm). The cut-height range is the shortest and tallest cut the deck offers. Most lawns are kept well inside it.
- Autonomous ZK 61 61G8 holds 15.5 gal (58.7 L) of fuel; Spartan KGZ-XD holds 17 gal (64.3 L) of fuel, a 1.5 gal difference. Tank size bounds how long a machine runs between stops. Consumption varies with engine, load and speed, so hours per tank are not fixed.
calculated figures and what isn’t comparable
Calculated by MowerFacts
- Autonomous ZK 61 61G8 works out to 6.2 acres/hour; Spartan KGZ-XD works out to 7.4 acres/hour, a 1.2 acres/hour difference. Calculated by MowerFacts from deck width and the published top speed at 80% efficiency; it is not a manufacturer figure, and real mowing is slower.
Not comparable
- Warranty: not published for Autonomous ZK 61 61G8.
- Blades: not published for Spartan KGZ-XD.
- Transmission: not published for Spartan KGZ-XD.
- Fuel Type: not published for Spartan KGZ-XD.
- Deck Material: not published for Spartan KGZ-XD.
- Start Type: not published for Spartan KGZ-XD.
- Price: Autonomous ZK 61 61G8 is dealer quote only.
Verified means each manufacturer publishes the figure. A bigger number is only a bigger number; nothing here says which machine is better. The full specification table is below.
Which is faster on your property? › Measure your lawn once and MowerFacts times all 2 against it.
| Spec | Autonomous ZK 61 61G8 Wright · Commercial |
Spartan KGZ-XD Spartan · Commercial |
|---|---|---|
| List price | dealer quote | $18,099 |
| Engine | ||
| Power Source | gas | gas |
| Engine Make | Briggs & Stratton | Vanguard |
| Displacement | 60.6 ci (993 cc) | 60.7 ci (994 cc) |
| Engine Power | 40 hp | 40 hp |
| Engine Model | 61G8 | — |
| Fuel Type | Gasoline | — |
| Start Type | Electric | — |
| Deck | ||
| Cutting Width | 61 in (1549 mm) | 61 in (1549 mm) |
| Blades | 3 | — |
| Deck Material | 7 Gauge | — |
| Deck Construction | Floating-Mulch | 6" Deep, Reinforced 7 Gauge Full-Floating Deck |
| Deck Gauge | 7 | — |
| Min Cut Height | 1.5 in (38 mm) | 1.5 in (38 mm) |
| Max Cut Height | 5.5 in (140 mm) | 4.8 in (121 mm) |
| Drive | ||
| Transmission | Hydro | — |
| Ground Speed | 12.5 mph | 15 mph |
| Drive Tire Size | — | 24x14-R12 Michelin Tweels� |
| Reverse Speed | 7 mph | — |
| Dimensions | ||
| Weight | 1310 lbs (594.2 kg) | 1310 lbs (594.2 kg) |
| Fuel Capacity | 15.5 gal (58.7 L) | 17 gal (64.3 L) |
| Length | 70 in (1778 mm) | 84 in (2134 mm) |
| Height | — | 75 in (1905 mm) |
| Commercial / Pro | ||
| Frame Construction | — | 1.5" by 3" Powder Coated Fusion-Bonded Solid Steel Bridge Frame |
| Seat Type | — | Supreme Custom Blackout Seat - Adjustable TecsPak Elastomer supports - 360 degree floating seat platform |
| General | ||
| Warranty | — | 3 yr |
Where these models differ, explained
Autonomous ZK 61 61G8: Specs verified against the retailer listing on Jun 6, 2026 — barryspowerequipment.com.
Spartan KGZ-XD: Specs verified against the manufacturer spec sheet on Jun 6, 2026 — joinspartannation.com.
Independent reference database. Specs compiled from manufacturer sources and normalized for comparison; verify with the manufacturer or dealer before purchase.