When to push the overdrive button on 1990 Ford F-150?

Answer 1

You should engage the overdrive button on a 1990 Ford F-150 when driving at steady speeds, typically above 45 mph, on highways or flat terrain. Overdrive helps improve fuel efficiency by allowing the engine to run at lower RPMs. It's best to turn off overdrive when towing heavy loads, driving uphill, or in conditions requiring more power, as this can prevent potential strain on the engine and transmission. Always refer to your owner’s manual for specific recommendations.