This analysis was revised when it was determined that the interim program , which began on January 1 , 1995 , would last 30 months rather than 18 months and there were changes in the estimated cost of deposit control testing and the addition , in the final rule , of a required deposit demonstration test to qualify test fuels for certification testing purposes .
When it was determined that the interim program , which began on January 1 , 1995 , would last 30 months rather than 18 months , this analysis was revised .