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.
- Bad Boy Mowers Rebel X — commercial: daily paid use and high acreage; 61-inch deck; gas powered
- Grasshopper 440 EFI — 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.
- Rebel X uses a Kawasaki engine; 440 EFI 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.
- Rebel X has a 5400 Hydro-Gear® 16cc Integrated Transaxle transmission; 440 EFI has a G3 Hydrostatic Transmission transmission. The transmission grade tracks duty rating and speed. Grade names are each maker's own and are not comparable across brands.
- Rebel X weighs 1,494 lbs (677.7 kg); 440 EFI weighs 1,320 lbs (598.7 kg), a 174 lbs difference. Operating weight bears on trailer payload, ramps and soft turf. On its own it says nothing about build quality. What Rebel X's weight means for a trailer ›
- Rebel X has a published top speed of 12 mph; 440 EFI has a published top speed of 11 mph, a 1 mph difference. Top speed is the maker's maximum in transport. Mowing speed is lower and depends on grass, terrain and the deck.
- Rebel X holds 13 gal (49.2 L) of fuel; 440 EFI holds 12 gal (45.4 L) of fuel, a 1 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.
1 more difference, calculated figures and what isn’t comparable
Other verified differences
- Rebel X has a 38.5 hp engine; 440 EFI has a 40 hp engine, a 1.5 hp difference.
Calculated by MowerFacts
- Rebel X works out to 5.9 acres/hour; 440 EFI works out to 5.4 acres/hour, a 0.5 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
- Fuel Type: not published for Rebel X.
- Deck Material: not published for 440 EFI.
- Price: Rebel X 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 | Rebel X Bad Boy Mowers · Zero-Turn |
440 EFI Grasshopper · Zero-Turn |
|---|---|---|
| List price | dealer quote | $18,955 |
| Engine | ||
| Power Source | gas | gas |
| Displacement | 61 ci (999 cc) | 60.6 ci (993 cc) |
| Engine Power | 38.5 hp | 40 hp |
| Engine Make | Kawasaki | Vanguard |
| Fuel Type | — | Gasoline |
| Cylinders | — | 2 |
| Deck | ||
| Cutting Width | 61 in (1549 mm) | 61 in (1549 mm) |
| Min Cut Height | 1 in (25 mm) | 1 in (25 mm) |
| Max Cut Height | 5 in (127 mm) | 5 in (127 mm) |
| Deck Material | 1/4" or 3-Gauge Thick Solid Steel | — |
| Deck Gauge | 3 | — |
| Drive | ||
| Transmission | 5400 Hydro-Gear® 16cc Integrated Transaxle | G3 Hydrostatic Transmission |
| Ground Speed | 12 mph | 11 mph |
| Dimensions | ||
| Weight | 1494 lbs (677.7 kg) | 1320 lbs (598.7 kg) |
| Fuel Capacity | 13 gal (49.2 L) | 12 gal (45.4 L) |
Where these models differ, explained
Rebel X: Specs verified against the manufacturer spec sheet on Jun 6, 2026 — badboycountry.com.
440 EFI: Specs verified against the manufacturer spec sheet on Jun 6, 2026 — grasshoppermower.com.
Independent reference database. Specs compiled from manufacturer sources and normalized for comparison; verify with the manufacturer or dealer before purchase.