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The LS7 vett is kind of a gas hog.
I would think a normal 5.7L one could do close to 40 mpg if driven at around 55 to 60mph.
Upping the compression to 13 to 1 pretty much rules out lean burn.
Do the gear change.
I found a guy that replaced the 21lb stock wheels on a nissan leaf with used 10 pound wheels. These wheels new are about $620 each, he said they only gave him about a 2 to 3% increase in range. They do work but it's a huge expense for a pretty tiny gain.
If you could go with much narrower tires like a 225mm it might be worth it.
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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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