Why do I lose gas mileage each time I turn on my vehicle

Hello, the distance to empty you are seeing is merely an estimate based off of historical values of driving in addition to the known level of fuel in your fuel tank. If driving habits show more fuel consumption in a window of time - such as with heavy traffic, excessive idling or city driving, the estimate of miles left will go down. If more conservative, economical driving - such as freeway driving - is done, then the mileage will be more stable. The only thing you should consider is if there is a fuel leak, if there is a check engine light indicating a possible air - fuel ratio problem, or if the fuel gauge may be reading erroneously. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops