Are you subject to IFTA? If so, that Kentucky fuel at $3.85 was no bargain at all. KY gives you 16.6 cents per gallon IFTA credit on your purchase. They collect 22.2 cents per gallon from your IFTA account on all gallons burned in the state. Let's say you run through KY and into IL. You buy 100 gal of fuel in KY at $3.859 and burn 50 in KY and 50 in IL. You get $16.60 put into your IFTA piggybank by KY when you buy that 100 gal. They turn around and take $11.10 out for the 50 gal. you burned in KY. That leaves $5.50 in the pig. Now you burn 50 in IL and they go to the pig to collect the $18.35 you owe them. OOPS, only $5.50 in the pig so they reach into your pocket and get the other $12.85 you owe them. Your bargain $3.859 fuel just went up to $3.9875 per gallon so your pocket is actually lighter by $398.75 and the pig is empty.
Now let's look at buying our 100 gal in nasty IL where it's $3.999 a gallon. EWE, we're already lighter by $399.90 so where's the bargain in that? Well, in IL they collect 36.7 cents per gallon burned in the state BUT they also put 36.7 cents per gallon purchased into the pig. When we spent that $400 they put $36.70 into our pig. Now KY dips in for their $11.10 leaving $25.60 and IL dips in for their $18.35 and OH, LOOK we still have $7.25 waiting in the pig for the next dipper. Now if we adjust our $3.999 by the difference it comes to $3.9265 net cost per gallon so by paying a higher price per gallon we created a lower cost per gallon.
If you have those pretty color stickers on the cab of the truck the price of the fuel on the sign and pump mean nothing and the cost of the fuel net of fuel taxes means everything.