OPINION
Tom Cress appeals from the grant of a partial summary judgment against him and in favor of Robert Scott, doing business as Western Auto Electric. Based on its reading of the New Mexico uniform jury instructions, the trial court dismissed Cress’s claim for loss-of-use damages in his suit for breach of an automobile repair contract. We reverse.
Facts. In June 1988, Cress purchased a used Maserati automobile for use in his insurance sales business. Cress drove the vehicle to and from work for approximately one and one-half years. On January 10,1990, the vehicle would not start and he had it towed to Scott’s repair shop. Cress authorized Scott to repair the Maserati’s timing system, including the timing belt and six bent intake valves. Following Scott’s repairs, Cress drove the vehicle forty to fifty miles over approximately six weeks. Cress believed that the vehicle still had a rough idle and took it to Perfection Motor Cars for a checkup. The mechanics at Perfection determined that the car needed a major rebuilding of the engine and that the timing system had been repaired incorrectly. During the time that Perfection worked on his vehicle, Cress borrowed his daughter’s vehicle, rode the city bus, or rode his bicycle to work, but he did not actually rent a substitute vehicle.
Proceedings. Cress sued Scott for breach of contract and negligent workmanship. As part of the complaint, Cress sought damages for the loss of use of his vehicle. Scott,filed a motion for partial summary judgment on the claim for loss of use. The trial court granted the motion and dismissed that claim with prejudice, holding that because Cress did not actually rent a substitute vehicle he could not be awarded loss-of-use damages. In a subsequent bench trial on the remaining issues, the trial court awarded Cress damages for Scott’s negligent repair.
Uniform Jury Instruction 13-1818 was not determinative in this case. — The trial court’s reliance on UJI 13-1818 and the committee’s comment was misplaced. The New Mexico uniform jury instructions define loss-of-use damages as “[t]he reasonable rental of similar property used during the time reasonably required for the repair of the damaged property.” SCRA 1986, 13-1818 (Repl.Pamp.1991). The committee comment to this instruction states that “[d]am-ages for loss of use are not recoverable unless ... other property was, in fact, rented.” Id. Although the trial court did not make express findings on this issue, it is apparent that it relied on the committee comment in making its determination that actual rental is required before a plaintiff can be awarded loss-of-use damages.
It is proper to measure loss-of-use damages by the actual rental costs reasonably incurred if an individual has rented a substitute vehicle. See Chesapeake & O. Ry. v. Elk Ref. Co.,
The only authority specifically cited in the committee comment to UJI 13-1818 is Curtis v. Schwartzman Packing Co.,
-Reasonable rental value is an appropriate measure of damages in the absence of actual rental. In Fredenburgh v. Allied Van Lines, Inc.,
-The trial court should fashion its own instruction when the uniform jury instructions do not apply. Rule 51 of the New Mexico Rules of Civil Procedure states that if the trial court determines that the jury should be instructed on an issue “the [uniform jury instruction] shall be used unless under the facts or circumstances of the particular case the published [uniform jury instruction] is erroneous or otherwise improper, and the trial court so finds and states of record its reasons.” SCRA 1986, 1-051(D) (Repl.Pamp.1992) (emphasis added). Because UJI 13-1818 was not determinative in this case, the trial court should have fashioned its own instruction on loss-of-use damages.
The requirement of “reasonableness" in the measure for loss-of-use damages. The purpose of awarding loss-of-use damages is to provide reasonable compensation for inconvenience or monetary loss suffered during the time required for repair of damaged property. If an individual avoids the inconvenience by actually renting substitute property then the measure of damages is the actual cost of the substitute. As we have reaffirmed above, if the individual cannot avoid the inconvenience, for financial reasons or otherwise, that person still may recover reasonable compensation. Just as actual rental must be “reasonable” under UJI 13-1818, so too must “rental value” be reasonable as a measure of loss-of-use damages in the absence of actual rental. The Fredenburgh opinion, however, offers no guidance in defining what factors should be considered in determining “reasonable rental value.”
The reasonable rental value of substitute property is a better measure of inconvenience than mere conjecture, see Fredenburgh,
The fact that an individual has another vehicle available does not preclude that person from proving loss-of-use damages, though the inconvenience to that person may be shown to be less than if another vehicle was unavailable. If the substitute vehicle is provided gratuitously by a third party, however, the wrongdoer should not benefit by such gratuitous aid. See McConal Aviation, Inc. v. Commercial Aviation Ins. Co.,
Conclusion. We reverse the trial court’s partial summary judgment and remand this case for a new trial on the issue of damages.
IT IS SO ORDERED.
