Cummins Diesel Forum banner

Rpm question

910 Views 7 Replies 5 Participants Last post by  firemansdiesel
I have read a few post saying they are around 1500 to 1650 rpms at 70mph. Mines is just over 1850. Is this correct . Hand calc on mpg is about 17.49. That's is over 5 tanks and 50/50 hwy/ city
1 - 1 of 8 Posts
Do you have a 3500 with 3.73 gear ratio?
1 - 1 of 8 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.