Pull the gas tank and and modify it for larger capacity. Or get a large fuel cell you can put in the back that you have a small pump in that will pump into the larger tank... like in the old trucks when you had to cycle / switch tanks...
I think tom also does economy tunes that may help you squeeze a MPG or two out of each gallon. Can't recall if he has ever gotten data back on how much more it gives you.
2001 ZX3 Zetec - Rebuild "The TICK" (
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2004 ZX5 SVT - Restoration "Code Name Rocket" (http://www.focusfanatics.com/forum/showthread.php?t=722698&referrerid=62897)