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Old 01-10-2012, 12:29 PM   #22 (permalink)
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Looks like according to the thread at TDi club:

Modified Thermostat for higher MPG's... - Page 31 - TDIClub Forums

"Modified Thermostat for higher MPG's" page 31 post 451 tells about a guy who used a mark 2 high temperature thermostat in his ALH TDI, and seems to be getting an increase in MPG's. Then again, you could just make one of my "Hybrid" 205 Deg F units:

I am seeing a 3-4 MPG increase over my previous T-stat that only reached 186 Deg F.

2002 VW Jetta TDI 5-speed(completed 01M-5-speed swap at 155K miles) 45 MPG City with the 01M, 5-speed 60+ MPG City. Nokian Entyre Low RR Tires. Experimenting with the "Hybrid" 205 Deg F T-stat:

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