Pеtitioner, DeCato Brothers, Inc., a New Hampshire trucking concern, appeals the affirmance by the superior court of the assеssment by the Vermont Department of Motor Vehicles (DMV) of $46,200 in unreported entry fees, pursuant to 23 V.S.A. § 417. DMV audited petitioner in January, 1985, for the periоd July 1, 1982 through November 30, 1982. Petitioner claims that DMV used improper methods in calculating the fees due. We affirm.
The statute provides:
(a) If a ton-mile tax, or a tax requiring quartеrly or monthly reporting is imposed on Vermont registered vehicles by another state in addition to that state’s diesel fuel tax, then there shall be charged an additional $10.00 for each entry into this state of any truck registered in the state charging the additional tax, fee or toll.
(b) In the event that a person so operates a motor truck on the highways of this state and fails to report that operation in accordanсe with regulations promulgated by the commissioner, the person shall pay a fee of $40.00 for each unreported entry into the state. The payment of the fee shall not preclude the imposition of penalties provided for in section 421 of this title.
23 V.S.A. § 417.
*495 In January, 1985, DMV audited petitiоner’s records to test compliance with the statute. At the time of this audit, petitioner had lost its records for 1982. However, DMV had previously done a “sample month” audit, in which it had audited May 1982 and November 1982. Using the records of the prior audit, DMV averaged the unreported entries it had calculated for May 1982 and November 1982 and multiplied that average by the number of months in the audit period, to arrive at an estimate of the unreported entries for the period of July 1 through November 30. It then multiplied the estimated number of unreported entries by $40.00, as provided in 23 V.S.A. § 417(b), to arrive at the assessment against petitioner.
Petitioner argues on appeal that DMV improperly used the month of May, 1982, which is outside the audit periоd, to arrive at the estimate of the number of unreported entries occurring during the audit period.
Petitioner also claims that DMV incorreсtly assessed fees for all its entries, though petitioner claimed some were so-called “bobtail” runs and therefore exempt. “Bobtailing” rеfers to the practice of breaking down the tractors and trailers on “dead head” runs, on which no cargo is carried, and stacking two trailers behind some tractors while running some of the other tractors without a trailer at all. This practice avoids tax liability under 23 V.S.A. § 417 for the tractоrs without trailers, since the tractors alone weigh less than 18,000 pounds, and thus are not “motor trucks” within the meaning of 23 V.S.A. § 420 and not subject to the entry fees under 23 V.S.A. § 417.
We address first petitioner’s argument that using a month outside the audit period to estimate the number of unreported entries during the audit period wаs improper. DMV had implicit authority under the statute to devise and employ auditing procedures to ensure compliance with § 417. The powers of an administrative agency must be construed to include such incidental, implied power as may be needed for the agency to achieve the task assigned to it.
New Hampshire-Vermont Physician Service
v.
Commissioner,
This Court gives DMV great deference in reviewing whether it used proper auditing techniques. “Absent a clear and convincing showing to the contrary, decisions made within the expertise of . . . agencies are presumed correct, valid and reasonable.”
In re Johnston,
In this case, petitioner’s records were lost, making a full audit for the period July 1, 1982, through November 30, 1982, impossible. DMV’s decision to use information from May and November 1982 to estimate the number of unreported entries during the audit period was reasonable, given the loss of the actual records. In addition, petitioner presented no evidence to show that May 1982 was an inappropriate month to use or aberrant in any way. Using infоrmation from May 1982 in arriving at the estimate was not unreasonable merely because that month was outside the audit period.
Murray’s Wines & Liquors
v.
State Tax Commission,
Petitioner hаs also failed to demonstrate that DMV erroneously assessed fees for “bobtail” runs. All entries by trucks registered in states that charge fees in additiоn to a diesel fuel tax on Vermont vehicles are subject to the entry fee. 23 V.S.A. § 417(a). Petitioner’s trucks come within this provision; therefore, the stаtute creates the presumption that all entries by petitioner’s trucks
*497
are subject to the entry fee. Exemptions are strictly construed. Sеe
Trustees of Vermont Wild Land Foundation
v.
Town of Pittsford,
This Court will not set aside findings of fact by an agency unless the findings are clearly erroneous.
In re Brileya,
Finally, petitioner claims that it should not be required to pay the entry fee for any “bobtail” runs because DMV never indicated in its regulations that petitioner was required to keep records distinguishing between “bobtail” and regular runs. This argument has no merit. It undermines the basic tenet of tax law that exemptions arе strictly construed and the burden is on the taxpayer to show eligibility for the exemption. See
Trustees of Vermont Wild Land Foundation,
*498 Affirmed.
