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also study the rolling resistance of tires,, look at the tire rack prius llr tire compareison,, tires made as much as 4mpg difference (all the same size) im eyeballing the ecopias they were # 2 on that test and are good wet weather tires also.(florida is rainy) you still did not give enough info,, if you drive all highway, it might help your mpg going a little taller/if you drive alot of stop and go it could hurt your mpg,.
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