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Right back at you -- if people didn't post these questions, I wouldn't have a reason to keep studying and learning new things!
I looked it up, and the one bureau whose mortgage FICOs may be affected by the presence of an installment loan appears to be Experian. In this loan's case, it might actually be a little boost but it isn't a major boost. I don't know (or can't remember) how far away your mortgage application is, but if it's over 6 months, you can substitute this loan with the Alliant SSL Technique at very very very little cost and get those points back and then some (on EX mortgage score). That link is here: http://ficoforums.myfico.com/t5/Understanding-FICO-Scoring/Adding-an-installment-loan-the-Share-Secu... If your EX mortgage FICO happens to be your "middle score", then getting rid of the auto loan and adding the SSL would actually raise your middle score a little bit (maybe 5 points? 10?)
but I wouldn't do Alliant SSL if your mortgage is less than 6 months away!