"Future Mars transfer vehicles will need around 400kW-2 megawatts of power to successfully ferry our astronauts or cargo to and from the Red Planet. We’re still exploring vehicle and propulsion concepts for Mars, including a combination of nuclear electric and chemical propulsion and other emerging options like Nuclear Thermal Propulsion."
https://www.nasa.gov/feature/glenn/2020/the-propulsion-we-re-supplying-it-s-electrifying
"Lithium-fed MPD thrusters developed in Russia have operated at power levels of 100 kilowatts, with efficiencies of up to 45 percent and plasma exhaust velocities approaching 50,000 meters per second (over 100,000 miles per hour (mph))."
"MPD thrusters using noncondensable hydrogen propellant will eliminate these concerns and provide higher exhaust velocities than lithium-fueled thrusters."
"Testing for these thrusters has demonstrated exhaust velocities of 100,000 meters per second (over 200,000 mph) and thrust levels of 100 Newtons (22.5 pounds) at power levels of 1 megawatt. For perspective, this exhaust velocity will allow a spacecraft to travel roughly 11 times the top speed of the space shuttle (18,000 mph)."
https://www.nasa.gov/centers/glenn/about/fs22grc.html
"Hydrogen and Oxygen gas spilt from water, we can "Hydroxy gas"
the molecules are bonded together positively in a ortho hydrogen state,
2.4x's to 4x's more powerful than the normal "para hydrogen" The common hydrogen "para hydrogen" the apposing negative state of hydrogen that can be pressurized into a metal tank or bottle. NOw they store it in plastic bottles., that can take high pressure for long periods that we see in pressured into a liquid metal bottle of gas. Hydroxy gas can NOT be stored this way, it is too powerful to store in a tank."
http://waterpoweredcar.com/