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I went from 27MPG to 35 MPG WOW!..
thank you so much for your help and to your patience if someone wants to get smart fuel i will highly recommend hho kit..
I bought this hho super, installed, everything works well. Excellent kit. Thank you!..
Thanks for your prompt response will get back to you as and when I can thanks..
i passed my nct right now thanks i will recommend you to my colleagues..
Good performance for Corvette C6..