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  1. b56tc

    what is your engine's highway speed happy place?

    this is killing me. OME 2", 315s, apparently stock gears as I'm seeing from other rpm/speed reports; 10 mpg at 2300 70mph indicated. New plugs rotors wires distributor intake tube. But old engine. Not using any oil however. Not chasing mpg's or wouldn't be driving this - but...
  2. b56tc

    what is your engine's highway speed happy place?

    That would be the question Best could be fuel efficiency; or power; or engine longevity. There does however seem to be a certain harmonic per engine design that balances all 3. On my Cummins it’s 1700 rpm. That’s 18.5 mpg. If I go to 1900 I’m a little faster but now 15 Looking for the sweet...
  3. b56tc

    what is your engine's highway speed happy place?

    Although at 2300rpm I am not regularly seeing 205 miles since fill up with a quarter tank left. Like, ever.
  4. b56tc

    what is your engine's highway speed happy place?

    I am about 8 mo into this new to me truck. I do not know whether the gears are stock or no. I was just mesmerized by Coys’ gas gauge at 87 mph and 3000 rpm and guessing the all day ends in about 20 minutes - 😜
  5. b56tc

    what is your engine's highway speed happy place?

    I'll be digging through the 250,000 mi transmission soon and it will be an opportunity to consider any gearing change "while I'm in there" I am running 35's (which are actually 34.3"OD) and while a bit under powered off the line or trying to pass - which I don't really care, and which could very...
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