Even in my Jeep, the full size spare tire and rim weighs about 50 pounds. Add another 10 for the jack, and you're up to 60. In a 4200 pound vehicle, that's not enough of a difference to make any measurable FE difference, and the peace of mind is worth carrying it.
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Call me crazy, but I actually try for mpg with this Jeep:
Typical driving: Back in Rochester for school, driving is 60 - 70% city
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