It surprised me.
Right now the TDI is giving me 36-38mpg which is normal for this time of year, extended idling, rolling resistance at -20, driving 75mph, etc.
It is also an automatic and they do not deliver the mileage that a manual will plus the autos have a bigger injection pump.
The Caddy on my 160 mile test drive gave me a solid 28mpg on secondary roads. On the big road at 75mph with a headwind it was giving 24 to 25 mpg.
I drive a minimum of 700 miles per week. Gasoline here right now is 3.49 per gallon. Diesel Fuel is 4.15 to 4.19 per gallon.
TDI....18.42 gallons figured at 38mpg is $76.44 per week.
Caddy....28.00 gallons figured at 25mpg is $97.72 per week.
$21.00 a week for a lot more comfortable car, I have to consider it.
Mike.