I have a slightly different problem from some of the other IOS 8 users here. I got all of my data from my old phone to show up on my new phone. Thought I was all set. A week or so ago I got gas, entered the data on the new phone and did a sync. At some point (maybe right then, but not 100% sure of that) the new gas transaction disappeared from my phone. So when I filled up today the previous transaction is missing and it looks like I'm getting 47mpg (which would be awesome).
Has anyone experienced this? Anyone know if it's possible to retrieve that transaction? I would try syncing again but I'm leery until I know what's going on.