If you are referring to water split into oxygen and hydrogen through electrolysis, the answer is alot; and far more than the onboard, engine driven electrical system can generate. If this were possible to run a car on solely "HHO" it would be the equivalent of a perpetual motion machine, and regardless of every conspiracy theory out there; every manufacturer would sell an "HHO" powered car.
Most states require the person to be 16. or older
Generators do not require much maintenance. If you have the gas and the oil level is alright, all you need to do is get it started (not more than a minute) and then you're all set.
It depends on the economy of the vehicle. If the vehicle gets 20 mpg, it will require 2.11 gallons.
It is 1,272 miles, so you will require 63.6 gallons of fuel if your vehicle averages 20 miles per gallon.
Depends entirely on what you are driving and the mpg of said vehicle. An example is a vehicle that gets 30 mph will require (30 divided into 2900) 96.66 gallons of fuel to travel 2900 miles.
Hopefully less then a gallon. It is a 21 minute drive covering 17.58 miles on I-25 but the vehicle and the traffic conditions will also play a role in the mileage.
Depends on the vehicle.
it depends on what vehicle you are driving. Driving ranges differ from vehicle to vehicle.
Depends on the gas mileage of the vehicle.
Impossible to say, will vary from vehicle to vehicle.
Depends on the MPG your vehicle gets.
A hybrid vehicle can use as much as half the fuel as a traditional car. This is a huge improvement and the gas savings will go a long way toward paying the extra for a hybrid.