This site has lots of information, I got most of my research questions answered here. My mileage varies from when I drive to when my wife drives  She gets about 13mpg on veggie, I get 11. It doesn't matter when the fuel is free though! My tank holds ~30gal I haven't measured it from empty to full, the installer (Shane@ Roverhybrids) filled my tank up before I picked the truck up. He said he didn't measure how much he put in either. As far as an excursion SVO conversion question, I can answer almost anything you ask! I can even hook you up with the Tank fabricator who did my tank, its pretty lightweight so shipping wouldn't kill you either. Let me know
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2001 Excursion 7.3l 131,270 mi
aFe Stage 2 Cold air intake
4" exhaust no kitty
Autometer Trans, EGT, WVO Fuel Level, and Boost gauges
4 pod A pillar
Turbo Master Wastegate Actuator
Vegistroke V3(Smells like angry Oil Shareholders...)
27 gal Custom Underbelly WVO Tank
Investigating:
DP Tune
Stand up against the pump! Switch to vegi, hybrid, solar or whatever people cannot use to regulate YOUR life! 
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