Hi all. I’ve recently had an issue with my 2018 CRV EX 2WD. Now, dont judge me for this one as it was a dumb moment ... unfortunately a few days ago I was idling in a parking lot on accessory waiting for a family member. I didn’t realize how long it had actually been on accessory until it was too late : my battery was shot. My poor baby wouldn’t start. I had a local Honda dealer look at it, say it was the battery as well, replaced it yesterday and sent me on my way. This morning I noticed my fuel mileage gauge was acting up. I would be sitting at a light, it would be 30.2MPG, and then all the sudden it would be 29.6. Any quick fixes ? Or is this a dealership issue ?