I believe the timing belt change is closer to 90K miles on the newer engines. Please correct me if I'm wrong.
We drive about 11,000 miles a year. The Taurus gets about 23 to 25 MPG combined. Our Beetle TDI gets 40MPG mostly rural driving. The following figures are from our local Shell station several weeks ago. An annual saving of $629.04 can add up over the years. Three years would pay for your timing belt and water pump, but I think the mileage is better for the I5. If we did a lot of freeway driving in the bug we might be getting 45MPG or better.
11,000 miles divided by 25MPG = 440 gals of gasoline times $3.979 = $1750.76 annually.
11,000 miles divided by 40MPG = 275 gals of diesel times $4.079 = $1121.72 annually.
165 gallons less petroleum product burned annually.