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Check those 4 sizes see which one is cheaper.
I went with slightly taller tires for one car, the price difference was about $12 per tire.
Turns out the taller size is the more popular of the 2.
The only way you are going to see any improvement by going to a smaller tire is if you regear to numerically lower ratio.
I think the only way you would see any improvement just going to a smaller tire and changing nothing else is if you delivered mail and all your stop and go covered the distance of some ones yard.
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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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