Section R865-4D-18 - Maintenance of Records Pursuant to Utah Code Ann. Sections 59-13-305(1) and 59-13- 312A. The records and documents maintained pursuant to Section 59-13-312 must substantiate the amount of fuel purchased and the amount of fuel used in the state and claimed on the special fuel report required by Section 59-13- 305(1).B. Every user must maintain detailed mileage records and summaries for fleets traveling in Utah, detailed fuel purchase records, and bulk disbursement records. From this information, an accurate average miles per gallon (mpg) figure can be determined for use in computing fuel tax due. No fuel entering the fuel supply tank of a motor vehicle may be excluded from the mpg computation. Refer to Tax Commission rule R865-4D-2.C. Individual vehicle mileage records (IVMRs) separating Utah miles from non-Utah miles must be maintained. Utah miles must be separated further into taxable Utah miles and nontaxable Utah miles. An adequate IVMR will contain the following information:1. starting and ending dates of trip;2. trip origin and destination;3. route of travel, beginning and ending odometer or hubometer reading, or both;6. fuel purchased or drawn from bulk storage for the vehicle; and7. other appropriate information that identifies the record, such as unit number, fleet number, record number, driver's name, and name of the user or operator of the vehicle.D. If the user fails to maintain or provide adequate records from which the user's true liability can be determined, the Tax Commission shall, upon giving written notice, estimate the amount of liability due. Such estimate shall take into consideration any or all of the following:1. any available records maintained and provided by the user;2. historical filing information;4. a flat or standard average mpg figure. a) The standard average mpg normally applied is four mpg for qualified motor vehicles and six miles per gallon for nonqualified motor vehicles.E. Section 59-13-312(2) requires that the user be able to support credits claimed for tax-paid fuel with documents showing payment of the Utah special fuel tax. If documents and records showing payment of the Utah special fuel tax are not maintained or are not provided upon request, the credits will be disallowed.Utah Admin. Code R865-4D-18