[Mr. Unassailable]

Additionally,
4.8 ci = .02078 Gallons

@$4/gallon the difference in 60° and 90° fuel is .08 cents per gallon. On a 35 gallon tank fill up (of my F250) I typically pay over $100 for 25 gallons. @ $100 (assuming $4/gallon) thats 25 gallons. 25 * .08 = $2.

So on a large tank fill up, worst case scenario I'm paying $2 more.

The problem with the mans theory is that the ground temperature does not change that much. I doubt the ground temp changes more than 5° over the course of a day. Probably more like 2-3°. And that worst case scenario is assuming the ground tank temp changed 30° from morning to afternoon.

I'm not changing my schedule to potentially save a few pennies.