The U-S Geological Survey has discovered an oil-based fuel additive known asM-T-B-E has contaminated some groundwater in eastern Iowa, and Iowa’sGovernor says it MAY be time to ban M-T-B-E in Iowa.Vilsack says it’s ironic republican legislators would consider banningM-T-B-E while they refuse to require use of corn-based ethanol, which is afuel additive similar to M-T-B-E.