FAQ
Can I use Ultra, Ultra Extra, Ultra Plus or E85 even if my vehicle is not an FFV?
If your vehicle is not an FFV, use of any percentage of ethanol over 10% is not covered by warranty or endorsed by the EPA. Some people have reported successful use of higher percentages of ethanol in regular, unmodified vehicles, but more long term studies are required before UB or the EPA will endorse the use. A study performed by the University of Minnesota has found that E30 (Ultra Plus) has been found to be the most economical in all vehicles, but the use of ethanol percentages over 30% may also cause computer sensors in newer non flex fuel vehicles to set off check engine lights or cause other performance issues. The first course of action would be to remove some of the fuel and replace it with straight gasoline or to take the vehicle to your maintenance shop to have the issues resolved.
