In my experience Honda, Nissan, and Toyota I have owned were all consistantly within .1 mpg of hand calculated. Based on internet reading Ram is the worst offender.
Everyone should be aware that the RAM in dash mpg calculator is very optimistic and cannot be trusted, many have claimed it’s off (inflated) by 10% or more. Hand calculating is the only way to get real numbers.
Also if you increase your tire size from 33 to 35 you are reducing the miles on...
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