Just calculating it for my own benefit, its coming to potentially 50-55 miles from the reserve based on my usage and returned mpg, probably in theory running it absolutely dry. The reserve seems to be a bit under 20% of the non reserve portion, so I'd be erring on the lesser amount if I was stuck at around 20% of whatever you get before you have to switch over, in my case on average 200, that gives a reserve of 40 miles but I wouldn't purposely use more than half that unless I was stuck.
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