Not to mention the time it takes to get the red dye out of your tank. I used some a couple years ago to get me to the station to fill up and my fuel is still red. Now mind you I don't drive all that often but after at least 12 to 15 tanks later it still is red.
As for the bio, I had to put some in one time and my mileage went through the floor. Going from 19.8mpg to around 12 was a shocker when doing a 110 mile commute a day.
John
2004 Chevy K3500 CCLB DRW Duramax. Stock.
1992 Sea Ray 300DA. 30 plus foot Express Cruiser on a trailer. 13,500# boat and trailer and 69' of combined length rolling. Over length/width permitted load.
SOLD-95 GMC K2500 SLE 6.5L TD, Relocated PMD to bumper #9 res., Custom Lowes special induction tube, Triple gauges on the pillar EGT, Trans, Boost, High Idle Mod, TCC-Lock up Mod, Custom Back up camera, DIY Manual Wastegate Controller, 4" from down tube to 5" stacks, Vac Pump Removed,2007 wheels, WMI by Cooling Mist 8gph @3psi 11gph on demand