Purchased a 1990 Crown Supercoach with DD 6-71TA and Allison MT647 from a School District in CA. They purchased it new in 1990 and had the original paperwork and maintenance logs. Bus has approx. 95k documented miles. Engine was replaced around 64k miles but no reason was documented as to why. The Bus was in service as a backup and for activities. We drove it back home via the southern route (CA,AZ,NM,TX,OK,KS) and got 9.86 mpg.