Glass Hydrogen Generators should not be installed in an automobile. Hit a good bump and it may break. That is just the nature of glass. As a master auto technician with over 20 years experiance I would advise anyone with a glass hho generator in there vehical to upgrade to a non glass construction HHO generator. If your HHO generator is installed correctly you should see a very nice increase in fuel milage. If it is installed improperly you may see a loss in fuel milage in vehicals made after 01/1996 as the OBD2 computor system in cars made after that date regulate the fuel wich means you will need a O2 extender or O2 enhanser, and likely a Map or Mass air flow inhanser.