Okay I dont see much on MPG performance modifications for the CIS engines..Although the system is capable of higher mileage, Im pretty sure..Ive seemed to get over 30 MPG and other times less than 20..And Im looking at the fuel system to consider preheating the fuel line as it supplies the fuel rail as many have done on other cars..And OMG..I see the return fuel line seem to go into a little chamber attached to the cold side of the AC unit and then on to the fuel tank..

Im wondering if the design purpose of this is to reduce the possibility of vapor lock in the fuel system..And no matter how warm the car is, one can feel the fuel rail is much colder than other parts in the engine compartment..And Id like to set up a preheat system from the engine coolant to raise the fuel temp too increase the vaporisation and encourage higher MPG..

Amazing the design features one discovers on these things!

Thanks..