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I don't believe a spare tire affects fuel millage that much. I think its more car makers realized the inflation kit costs less then a spare tire and jack. Kicker is that many vehicles don't still have a space for the spare even if you bought one. I bought a Ford EcoSport and the only option for a spare is buy a bracket to attach to back. trouble with inflators and sealer is that many times the damage is too much for a sealer to even work, or that the tire went flat quickly and caused too much sidewall damage. So I guess many will find out that you have two choices, tow the vehicle to get tire fixed, have a service come out and replace tire. Either way that's going to take more time then simply changing a tire yourself. Seems like automakers decided for you that you can't handle changing a tire anymore and they can save a few bucks per car to not include one. Here's a inflator kit if you want to waste your time.