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The scoring by FICO of multiple inquiries as a single inquiry (referred to by FICO as "de-duping") is limited to auto, student, or mortgage loans, and applies to inquries made within a sliding window that varies by scoring model number.
The key is whether the inquiry is coded, in this case, as an auto loan.
I am unsure if recreational vehicle loans are properly included as being an auto loan under CRA guidelines.
If not coded as an auto loan, the multiple inquires will not be de-duped.
Hi Robert. There are two questions in our OP's post -- one implicit and the other explicit.
(1) The implicit question is whether an RV counts as an auto loan and will therefore be de-duped.
(2) The explicit question is whether the score generated by the first inquiry will be based on a report with zero inquiries whereas the score generated by inquiries 2-20 will be based de facto on a report with one scoreable inquiry. And thus the very first inquiry might result in a higher score than all the rest. (If the report had X inquiries before the first auto inquiry, then it would X for the first score and X+1 for all the rest.)
I have never thought about question #2 as it touches auto loans. If it were mortgages, then the scores generated by all of the mortgage inquiries would be based on a report with the same number of scoreable inquiries, since FICO adds an additional rule which is to ignore all mortgage inquiries generated in the last 30 days. I don't think auto inquiries have that 30 day rule, however, so our OP's conjecture seems to me likely to be true.
Curious to hear if anyone knows for sure.