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 Renegade Gas — commercial: daily paid use and high acreage; 61-inch deck; gas powered
- Gravely PRO-TURN 660 KAWASAKI EFI — commercial: daily paid use and high acreage; 60-inch deck; gas powered
What’s different? The 4 differences that matter most, from the published figures.
- Renegade Gas uses a Kohler engine; PRO-TURN 660 KAWASAKI EFI uses a Kawasaki® 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.
- Renegade Gas has a 1/4" or 3-Gauge Thick Solid Steel deck; PRO-TURN 660 KAWASAKI EFI has a 7 ga deck.
- Renegade Gas has a published top speed of 13 mph; PRO-TURN 660 KAWASAKI EFI has a published top speed of 15 mph, a 2 mph difference. Top speed is the maker's maximum in transport. Mowing speed is lower and depends on grass, terrain and the deck.
- Renegade Gas holds 13 gal (49.2 L) of fuel; PRO-TURN 660 KAWASAKI EFI holds 12.5 gal (47.3 L) of fuel, a 0.5 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
- Renegade Gas works out to 6.4 acres/hour; PRO-TURN 660 KAWASAKI EFI works out to 7.3 acres/hour, a 0.9 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
- Transmission: not published for PRO-TURN 660 KAWASAKI EFI.
- Fuel Type: not published for Renegade Gas.
- Deck Construction: not published for Renegade Gas.
- Drive System: not published for Renegade Gas.
- Discharge: not published for Renegade Gas.
- Cut height range: not published for PRO-TURN 660 KAWASAKI EFI.
- Price: Renegade Gas 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 | Renegade Gas Bad Boy Mowers · Zero-Turn |
PRO-TURN 660 KAWASAKI EFI Gravely · Zero-Turn |
|---|---|---|
| List price | dealer quote | $17,899 |
| Engine | ||
| Power Source | gas | gas |
| Displacement | 61 ci (999 cc) | 61 ci (999 cc) |
| Engine Power | 38.5 hp | 38.5 hp |
| Engine Make | Kohler | Kawasaki® |
| Engine Model | — | FX1000 EFI |
| Fuel Type | — | Gas |
| Deck | ||
| Cutting Width | 61 in (1549 mm) | 60 in (1524 mm) |
| Min Cut Height | 2 in (51 mm) | — |
| Max Cut Height | 6 in (152 mm) | — |
| Deck Material | 1/4" or 3-Gauge Thick Solid Steel | 7 ga |
| Deck Construction | — | Fabricated X-Factor® 3 |
| Deck Gauge | 3 | 7 |
| Discharge | — | Side |
| Drive | ||
| Transmission | Hydro-Gear® 16cc Pump; Parker® 18ci Wheel Motors | — |
| Ground Speed | 13 mph | 15 mph |
| Reverse Speed | — | 6 mph |
| Drive System | — | Hydrostatic |
| Dimensions | ||
| Weight | 1628 lbs (738.5 kg) | 1601 lbs (726.2 kg) |
| Fuel Capacity | 13 gal (49.2 L) | 12.5 gal (47.3 L) |
Where these models differ, explained
Renegade Gas: Specs verified against the manufacturer spec sheet on Jun 6, 2026 — badboycountry.com.
PRO-TURN 660 KAWASAKI EFI: Specs verified against the retailer listing on Jun 6, 2026 — haightsmobile.com.
Independent reference database. Specs compiled from manufacturer sources and normalized for comparison; verify with the manufacturer or dealer before purchase.