What does she think about the plan? I have found that suggestions that we cut costs by asking my DH to give up something he enjoys do not tend to go over well. . . .
Also surprised that an Audi has that much less residual value than a same-year-or-older Civic. But do the math -- how much longer would you reasonably expect either car to last, how many miles driven during that timeframe, cost of gas, comparative repair histories/likely future repairs over the remaining lifespan. And where is the $2K going to come from/how much is it going to cost you? If you have debt at 25-30% interest, even $2K for a Civic leaves you with $2K less to pay off that usurious loan, which is likely to cost you more than you will save in gas over the extra time it takes you to pay off that debt.