This makes gas washers much better suited to heavy-duty jobs, like cleaning walkways and pavement. The most powerful pressure washer that Ryobi sells is the 3,300 PSI Honda GCV190 Gas Washer.

This gas-powered pressure washer has a powerful engine that provides up to 3700 PSI. It also comes with two large tires that make rolling through dirt, gravel, or other terrains relatively easy ...

Water pressure is typically measured in pounds per square inch (psi). Gas-powered models typically put out 2,000 to 2,800 psi of pressure compared with 1,300 to 1,700 psi for electric models.

At $499, the Generac is the most expensive washer I tested, but it’s similarly priced to other gas-powered washers I tried. Still, it’s more than twice the cost of the top electric pressure ...