I'd much prefer a line graph for avg mph history. It would display a vehicle's history a lot more clearly. Another solution could be to allow settings for "Recent Fuel-ups" to go back further and/or include the entire history.
If a line graph isn't possible, the bar graph should at least be optimized by making the bars thinner and pushing them closer together. There is a lot of visual space to fill.
(Love the site! Love it death now that there is an app!!)
danieljmick 
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