dude wheres my car

i drive a 1997 diesel range rover am getting about 20mpg this company says they can get that up to 40mpg even 50, what do you think?
www.hydrogen-concept-cars.com
plz get back to me

Remember what mom used to tell you about things that sound too good to be true....?

Check if they are genuin and they are going to provide you that much of mg that should good. indeed it will help you a lot as well. i think you should go for it.