BMW 318i using a Nano Star system with EFIE (Oxygen Sensor Enhancer) 2009 fuel consumption results, for emissions see extensive report on Rolling road page
Engine
Average mpg without Hydrogen Generator
Average mpg with Hydrogen Generator
Savings per Tank
1.8i
29.56
41.27
£ tbc
BMW 325i using a Nano Star system with PWM July 2010 Emissions results