The graph isn't updating for me. It only shows my first two fuel ups. I've had 5 since the last date shown on the graph. Is it broken or am I missing something?
The graph only plots fuel-ups where MPG is calculated. Since several of your fuel-ups are marked as partial, you've only had MPG calculated on two of your fuel-ups so far. Once you start adding a few filled tanks in a row, you'll get more entries on the graph.
Linear Mode
