I have used hydrogen on my trooper for 10 years now, I will not drive my trooper with out hydrogen. 16 mpg in town and 20 mpg on the highway, factory. With the booster on 25mpg in town and 28 on the highway…as per scan gauge II…The power factor is the main thing, it is like driving a muscle car with the booster on…The engine is still running like new at 130000 miles. I built my booster from ebay parts , before the on line kits…I love it…