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Originally Posted by MTI
So in a modern car, using the proper octane for the car should get you better MPG, but putting premium in a car that doesn't need it would be a waste.
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That's my conclusion, in a nutshell. The 190e got mid or premium; the Mustang does not. The VW bus gets it as it pre-detonates easily on warm days. The Jetta gets neither. 
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1992 300D 2.5T
1980 Euro 300D (sadly, sold)
1998 Jetta TDI, 132K "Rudy"
1974 Triumph TR6
1999 Saab 9-5 wagon (wife's)
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