Quote Originally Posted by 53driver View Post
I have been searching for the "bucket RPM" of this motor...
I.e. "I'm low on fuel and I need max range RPM for 5th gear"
It's somewhere between 2300 and 2800.

If I should cruise at 85+ (ha!) my mileage goes down to low/mid thirties also.
I don't have any data for sustained ops at 4000 RPM although that would make for an interesting data gathering expedition....hmmmm.
On my return trip from San Diego I did an Iron Butt and pretty well stayed 85-90 from Bakersfield to Tacoma aside from the nasty bit in the Siskiyou's. I stayed in the low 30's for mpg. It was also cold/wet and generally unpleasant for the last half. It was below 50 degrees almost the entire trip and I seemed to remember hitting 28 degrees when I summited the pass.