The Consolidated Edison Company of New York (Con Ed) appeals from a judgment of the United States District Court for the Southern District of New York, Motley, Chief Judge, dismissing its complaints in two consolidated actions in which Con Ed sought a tax refund of $412,420 paid during the taxable years from July 1, 1972 through June 30, 1977 and July 1, 1979 through June 30, 1982. The district court ruled that sections 4481 and 4482 of the Internal Revenue Code (I.R.C.), 26 U.S.C. §§ 4481, 4482, permit the Internal Revenue Service (IRS) to tax Con Ed’s utility trucks as truck-trailer combinations, for federal highway use tax purposes, merely because the trucks are equipped with pintle hooks capable of attachment to heavy trailers. 1 Con Ed contends that its trucks pull heavy trailers only during emergencies and that it was entitled to a factual determination by the IRS as to whether heavy trailers are “customarily used” with its trucks. 84 Civ. 1167 (April 9, 1985).
Con Ed argues that the classification of a vehicle as a truck-trailer combination merely because the vehicle is “equipped for use” in combination with heavyweight trailers, without a factual determination as to “customary use,” is inconsistent with I.R.C. §§ 4481 and 4482. However, the Highway Revenue Act of 1956, Pub.L. 84-627, 70 Stat. 374, expressly delegated broad authority to the Treasury Department to prescribe “formulas or other methods for determining the taxable gross weight of vehicles by classes, specifications or otherwise.” I.R.C. § 4482(b). Congress envisioned and approved of the IRS’s determining “taxable gross weight” by reference to the vehicle and any trailer that the vehicle is “equipped” to pull, “whether or not [the trailer is] so used in connection with a particular vehicle with respect to which the tax is imposed.” S.Rep. No. 2054, 84th Cong., 2d Sess. 8,
reprinted in
1956-
Con Ed also argues that the Commissioner abused his discretion under I.R.C. § 7805(B) in applying Revenue Ruling 76-294 retroactively to its 1972 through 1976 taxes. We disagree. Revenue Ruling 76-294 does not modify the tax law as it had existed in 1972. First, the lightweight-heavyweight distinction had already been presaged by the 1957 Revenue Ruling,
supra,
which by expressly premising single unit treatment on the fact that the utility truck’s trailer was lightweight thereby effectively put utility companies on notice that heavyweight trailers might well be treated as truck-trailer combinations. Second, during the interim between the IRS Revenue Rulings of 1957 and 1976,
supra,
both of which involved utility trucks, the IRS applied the lightweight-heavyweight distinction in cases that involved other vehicles and that preceded Con Ed’s 1972-77 tax payments.
See, e.g.,
Revenue Ruling 72-109, 1972-
Affirmed.
Notes
. In 1956, pursuant to Congress’ delegation of broad rulemaking authority under I.R.C. § 4482(b), the Treasury Department promulgated Reg. § 41.4482(b)-l(d), which sets forth four categories of vehicles based on design speciflcations: (1) single units; (2) tractor-trailer combinations; (3) truck-trailer combinations, which are trucks “equipped for use in combinations”; and (4) buses. The issue in this case is whether the Con Ed trucks should be placed in catagory (1) or in the higher-taxed category (3).
. In so holding, we concur in the results in .
Minnesota Power & Light
v.
United States,
. While we note that some of the Revenue rulings expressly referred to trailers "customarily used” with trucks of the type to which those trailers are connected,
see Minnesota Power and Light,
