You would have to do a lot of research before pulling the trigger on a $2000 FI system to get better gas mileage. The big picture is, at a couple miles per gallon savings, it would take years of driving your old car to pay for the system. I bought a used tool truck that had a Holley system on it. After having issues with it numerous times, I removed it and put a Quadrajet back on. I was suprised but the mileage was the same. 5 mpg. May be 5.5 on a good day!