What is the maximum cruising speed my car can sustain in RPMS for a 9 hour road trip on the Autobahn?

The car is a 2003 Honda Element. It is an awesome model and it has 160 hp I believe. It is a 2.4l KA24 engine that is used most of the other Honda car models such as the 4 cylinder Accord. The car redlines at 6500 rpms.

How many rpms can this car comfortably cruise at the maximum without risking engine damage and a rapid decrease of its lifespan?

With a 15 year old car you shouldn't be thinking of red lining it
Somewhere around 70 -80 mph is probably it's cruising speed. This usually equates to around 3,000 rpm on petrol (gas) engines
I would also advise a break every 3 hours to ease the stress on the engine. Fuel consumption will be greatly improved by cruising at 65mph

Obviously the above is conditional on the car being properly maintained with all fluid levels checked and tyres inflated to the correct pressure. If the car is fitted with a timing belt you also need to check when it was last changed.

2003 Honda Element troll strikes again.

5500

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