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It looks like you are getting 30mpg with your caddy so I would think you are doing a lot of highway driving?
In your case I would think the lighter flywheel would lighten your wallet and consume time more than anything.
If I was going to bet on what would save more money between a light flywheel and say something like the proper use of lawn edgeing to build an air dam and side skirts, I would put my money on the the lawn edgeing.
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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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