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The warranty on my 2013 RDX just expired a month ago, so surely yours is still covered... why not take it in to the dealer and have them take a look? If they recommend any work that's going to be $$$ and you smell bullsh*t, there's no obligation to pay. (And if it was something that needed early replacement causing your crappy fuel economy, it would very possibly be covered under warranty anyway.)
To be honest, though, I doubt there's anything wrong with the car. My RDX is driven by the wife 99% of the time (80% city, 20% highway) and last time I checked, average gas mileage over the last few thousand km's was 13.7L/100km. She doesn't make any effort to save fuel, but doesn't drive it hard, either. I don't think it's unusual to be averaging ~14L/100km if you're doing lots of city driving (esp in traffic) given how much better the RDX is on the highway compared to the city.... big V6 is thirsty in low gears and accelerating. How much of your driving is spent in heavy traffic? Lots of stop-and-go shit? That could def explain it.
This almost certainly won't help fuel economy at all, and probably doesn't matter one bit, but from what I've read the general consensus is that Shell 91 is considered the top choice in BC.
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