around 2.4k.i get in 6th as much as i can. if i need to pass some one i down shift.(its really not that hard)

 

I almost never put into 5th on a city unless i go over 45mph + i just shift around 4-4.5k, thats seems to be when the engine is best in shape before engaging or having to vtec the car. btw i get 300miles + a tank

 

It seems the range is anywhere from 2.5k up to 5k. I know the car is capable of cruising for long period at 4k or more (e.g. highway cruising). And obviously cruising at the lowest possible rpm (e.g. sub 2k) is not the best, and cruising at the highest possible rpm (redline) is not the best

So the question becomes what is the optimal rpm for cruising in terms of engine efficiency and longevity?

 

IMO anything under 3k youll probably be lugging the motor, and anything over 5k is too much if your just cruising. 4k seems to be a good balance, but if your on the highway for a long time then its best to use 6th and keep it low as possible.

 

4k is pretty loud seriously.... I've read so many mpg threads and it seems like people like crusing between 2.5~3.5

 

never drive below 3rpm, usually shift at 4 to 5 depending on mood

freeway i cruise at 65-75mph, sometimes at 90mph, which means lots of rev