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I've read that if you have multiple inquiries from auto or mortgage within 2 week period it will count as 1. here is quote on inquiries from MyFico.
Inquiries listed here are requests by lenders to view your credit report because you have applied for credit with them. Having many inquiries can hurt your FICO score, because that might be a sign that you are in a financial situation where you need credit. A single inquiry, however, will have little impact on your score.
Three other kinds of inquiries do not affect your FICO score and are not listed here. One occurs when lenders search for consumers that might qualify for pre-approved credit. Another occurs when you request to view your own credit report, such as when ordering products on myFICO. Other inquiries that do not affect your score are any inquiries used for purposes other than granting credit, such as an inquiry requested by a landlord. Note: In general, inquiries contribute to less than 10% of your FICO score.