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Hi,
I put these into both 92s, doing a 250 mile/week commute with mixed stop and go, hills, some highway. MPG stayed within .5/gal on both cars. I average about 20mpg during spring/summer. Dead of winter was 18-19 mpg. No huge power increase, but noticably smoother power delivery.
The tires make a difference- the heavy Tribecca wheels and 255/35-18 tires cut my mpg by 2 mpg from the 215/55/16 Contis on the 97.
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 Cheers! Gordon
1997 Ebony #308 113k "The Black Diva"SOLD 
1992 Black over Liquid Silver 152k SOLD
1992 Ebony 251k 444 SOLD
1999 Silver SLK230 134k SOLD
1997 Green Outback 137k SOLD
2013 Honda Accord I4 SOLD
2015 Subaru Crosstrek 30k
2018 Tesla M3 30k
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