Wow those are some good preliminary results. You should get a quick return on investment although I still think you have other issues. I guess I shouldn't complain about my 24MPG average with my two cars, although I'm shooting for closer to 30MPG .
99 CSVT Green/Tan
# 84 of 2760
Built on Wednesday, September 30, 1998
15.376 @ 92.00 MPH Stock
75,000Km
96 Contour GL
2.5L V6 ATX 170,000Km