Maybe the question is what states post the commercial truck tax exempt price and then by law have to charge non-commercial diesel fuel purchasers the tax. In Oregon it was 30 cents per gallon more. I think Indiana and Oregon are like that.
Found this other post: Just a heads up to those of you who have never traveled to Indiana and several other states who post deceptive fuel prices. In Indiana you will see the fuel price on the signs in big numbers and then under them you see tax exempt in very small letters. Example: $3.89 tax exempt and then when you pull to the diesel pump it is $4.10 with the tax. Most all other states post the tax added price. Just a heads up to you who will be traveling to the International Rally in Goshen.