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Yes, you can complain about it but you wouldn't get anywhere without and vital proof of having better gas mileage/fuel range prior to their abuse. Be prepared to switch dealers for service and maintenance if you complain (hard). I would just inform them and if they do anything to compensate you, great! If not, jump ship and move elsewhere.
I don't complain hard on restaurants and car service centers because they can easily pig around with what I'll be getting without me noticing it.
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