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Of the 3 not so old VW engines the 1.9d turbodiesel, 2.0L N/A and 1.8t turbo gas. The 1.8t got the worst milage and on top of the lower MPGs it needs more expensive premium gas.
In stock emissions compliant, corner cut, cookie cutter engines the turbo will get lower fuel milage.
To make a turbo gas engine get the best cruise mileage possible you need to make it act like the N/A engine as much as possible.
A turbo gas motor could be made to get better mileage than an N/A engine, but I wouldn't bother.
Another big thing for turbo gas motors is can it use regular gas?
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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