During this challenging time, all dealers and automotive retailers are looking at their advertising expenses and trying to decide how much they can cut without it hurting their business any more than necessary.   While there is no magic formula, it is a fact that search volume is down in the auto industry by around 30%, which gives you a rough idea of how much (at least) you probably can cut your digital ad spend with little negative affect.  On the other hand, reaching out to your…