Would there be interest in a dodge TBI setup made for our cars?

I'm interested in the gas mileage improvements. Can anyone throw out some figures? Even if it is only 2 mpgs that's worth the $300-400 for this upgrade over the period of a couple months. Does EFI improve mileage a lot more than TBI or is it about the same? Just wondering about the details of this. Thanks for any info and good luck on making sales 66plyValiant!

before the changeover the fifth avenue (car I did the change on) was averaging 20 canadian MPG. after the change I seen 23 MPG on the first tank and I ran a 1/4 tank through and rough calculated it to be about 23-24 MPG, mind you I haven't fully adjusted the timing perfectly (set around 12 BTDC and fuel pressure not checked yet) and I haven't had a chance to do any highway driving, most of my results were from the country roads I live on (mostly 45-50 MPH) it idles and starts much better then the carburator that was worn out ever did even when it was rebuilt, it seems to pull up hills better and I don't have to have my foot as far into it to do it. So far I would say it was worth it but I am going to do some more testing before I sell any harness's or complete kits

(I may sell one or two at the first as test muels for highway and city milage, and they will be highly discounted, buyer must be willing to work with me though and give MPG results)