looking at a 90 300ce and drove it today,it's been setting for probably 6 months or so,fired right up nice and smooth,trans shifts nice,everything actually seems to work ,but what bothered me was the rpm's,what kinda rpms should it be turning at say 65,it was showing just a hair over 3000 which i feel is kinda high but i'd just like to know if this is normal,also what kinda milage can be expected from these.