You could get this http://www.dynamicefi.com/ to use on a GM TBI and be able to switch between different fuels without reprogramming everything or need of a laptop. Kinda nice when you couldn't find E85 and need to switch back to gas.
The different modes preprogrammed on that can adjust the timing for different blends.
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Paul
1975 Wagoneer DD
360 with large cap ecm controlled HEI, TBI EFI, Comp Cam 260H, Edelbrock Performer Intake, CS130 alt, 4 row radiator, S10 steering box, QT w/LO, WT 3.54 D44 axles. Rancho 9000X's, ~4" lift, Caddy rear discs.
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