Calculate the break-even point on a daily driver.

Let's say you drive 10,000 miles per year. Gas costs $4/gallon. The X5 we will say gets 18 MPG on average. Annual fuel expense: $2,222

Now let's try an E30. Same numbers, but 28 MPG. $1428/year.

Savings of ~$800.

Cost of E30 = $4k. Insurance, tabs, maintnence, misc = $1-2k per year.

So in theory you are looking at 5 years before you really "break even" on your gas expense. Year 6 you can finally "save money" with your E30.

There are other advantages to a daily driver. Less wear on the X5, more fun to daily an E30, etc.

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2002 X5 4.6is - Titanium Silver / Black Alcantara - Dinan Stage 2 - Bilstein/Eibach - Brembo BBK ----SOLD---
1993 318i - Brilliantrot / Tan - bone stock daily driver