x = Distance between "cheap" pump and your local pump. (miles)
D = Difference in total cost (i.e. I saved $10)
Y = Cost per gallon ($/Gallon)
M = Mileage (Miles/Gallon)
If (X/M) * Y > D, don't go.
For example. Let's say I find somewhere where filling up the (13 gallon) tank is $0.25 cheaper per gallon. I save $3.25. Let's say gas cost $4 and I get ~30 mpg. That means I have to drive less than 20 miles round trip out of my way to get gas.
Either way, you burn more gas, waste time, and are a moron if you drive far to save a nickel.
D = Difference in total cost (i.e. I saved $10)
Y = Cost per gallon ($/Gallon)
M = Mileage (Miles/Gallon)
If (X/M) * Y > D, don't go.
For example. Let's say I find somewhere where filling up the (13 gallon) tank is $0.25 cheaper per gallon. I save $3.25. Let's say gas cost $4 and I get ~30 mpg. That means I have to drive less than 20 miles round trip out of my way to get gas.
Either way, you burn more gas, waste time, and are a moron if you drive far to save a nickel.
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