---
kind: "section"
citation: "40 C.F.R. § 610.23"
title: "40"
number: "610.23"
heading: "Operator interaction effects."
url: "https://uscodex.org/cfr/40/610.23"
---

# §610.23. Operator interaction effects.


The device will also be evaluated with respect to:

- (a) The degree of sensitivity of device effectiveness to variances in installation, operation and maintenance;
- (b) The adequacy of manufacturer-furnished instructions for minimizing variances in installation, operation and maintenance;
- (c) The extent to which device installation or use, or the effects of such installation or use, relate to Federal emission control regulations;
- (d) Effects on the performance, safety, or occupant comfort of the retrofitted vehicle, and on that of other vehicles; and
- (e) The relationship between total cost of ownership of the device (purchase price plus maintenance costs) and the cost savings realizable from its fuel economy effects.

## Notes

### Authority

Authority: Sec. 511, Motor Vehicle Information and Cost Savings Act, as amended (sec. 301, Pub. L. 94-163, 89 Stat. 915 (15 U.S.C. 2011)).

### Source

Source: 44 FR 17946, Mar. 23, 1979, unless otherwise noted.