Query regarding gasoline vapor recovery unit

I was reviewing a design of a vapor recovery unit (VRU) for recovery of gasoline vapors (VOC's) by absorbing in gasoline for one terminal. In the design, a heavy gasoline with IBP 140 C and FBP 210C has been considered. Normally gasoline available in terminal also has light ends as per the BS specs. My understanding is that quantity (flowrate) of heavy gasoline required will be less to absorb the VOC's in absorption column as compared to standard gasoline which has light HC's in it. Can anybody confirm regarding this? Hence, according to me the unit is not correctly designed. Also request to please share any supporting study/literature data regarding the same.

The HC concentration considered in feed vapors to VRU is 60%(along with air)for the design of Vapor recovery unit. Seems on higher side to me. Can anybody confirm regarding this also ?