From fueleconomy.gov
02 Jetta:
2.0L 5spd
Regular fuel
21/28mpg
Cost to drive 25 Miles: $3.76
07 Jetta
2.0L 6spd Turbocharged
Premium fuel
21/29mpg
Cost to drive 25 Miles: $4.00
Sorry, but that article is full of crap. Turbochargers allow for more power out of smaller engines. If you turbocharge the same size engine, you'll get more power out of it. To get more economy, you'll have to pick a smaller engine and turbocharge that. Then you have to ensure that doing so improves economy enough that cost per mile is significantly lower than the N/A engine despite the premium fuel requirement. Also, you can expect reduced longevity from the turbo motor.
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