Surprises are meant for birthdays, not airplane flights. Consider before your next flight all the decisions you might have to make, and think about when you will need to make them.
I have been incredibly happy, extremely sad, overwhelmingly afraid, and very content in various Cessna 150s over the past 45 years.
The only way to deal with decisions relating to fuel figures and alternate airports is to draw a firm line on the gauge and stick to that plan.
My happy place is metal and T-shaped and smells like 100 octane.