[larrydag]

Here's an interesting quote from a Honda aftermarket website

We have found Honda ECUs work particularly well with larger injectors. For example one Hondata customer using 830 cc injectors in a B20 turbo has drivability indistinguishable from stock and achieves 30mpg.

http://www.hondata.com/techecuanatomy.html

So maybe ECU modifications could be performed to help boost FE on fuel injected cars.