present invention 39 s method of achieving optimal ignition timing utilizing a fuel knock detector 46 the present invention includes two preferred apparatuses that when used with a dynamometer result in optimal ignition timing to accommodate bio diesel gas blends for use in gasoline engines each apparatus is used in conjunction and in parallel with the original power train module in one preferred method the present invention utilizes a fuel knock detector 46 to optimize the ignition timing to accommodate bio diesel gas blends for use in gasoline engines also shown are temperature 48 humidity 50 pressure 52 and exhaust products sensor 54 generating data used by computer 40 to control engine controls 38 of system 36 engine states 26 including start up 28 warm up 30 cruise 32 and shut down 34 provide feedback 44 for adjusting the timing of system 36 referring to fig5 shown is a flow chart 56 of the setup operations required for the present invention 39 s system of utilizing biodiesel gasoline blended fuel the present invention 39 s system of utilizing biodiesel gasoline blended fuel provides means to calibrate the engine fuel timing for a plurality of fuel ratios diagnostic equipment is used to identify optimal power output which is in turn recorded and stored into the engine management system interdisposed in the vehicles electrical system referring to fig6 shown is a block diagram 58 of the fuel operation 39 s required for the present invention 39 s system of utilizing biodiesel gasoline blended fuel the present invention 39 s system of utilizing.