Quote:
Originally Posted by gumby79
DWL (driving with load) is driving with the highest possible Vacuum reading posable aka the best mpg per load.
|
Uhhhh.... No.
Quote:
Originally Posted by gumby79
There are many examples of this. The real world trumps the paper this time.
|
Oh, okay. I'm sure that must be the case. You sure showed me. And everyone who ever put in a taller final drive. And all the car manufacturers who invested in production variable cylinder technology.
Tell you what. Explain why the MDS 5.7L Chrysler Hemi gets better gas mileage than a non-MDS 5.7L Chrysler Hemi, between a 2005 Dodge Ram 1500 pickup truck with RWD and a 5.7L non-MDS engine and the 545RFE transmission, and the 2006 Dodge Ram 1500 pickup truck with RWD and a 5.7L MDS engine and the 545RFE transmission. The 2006 had an EPA rating that was 1 MPG better than the 2005 (city and highway and combined). No other significant changes were made to this truck from 2005 to 2006, so they both weighed the same, and both had the same aero.
2005 Ram ->
https://www.fueleconomy.gov/feg/noframes/21104.shtml
2006 Ram ->
https://www.fueleconomy.gov/feg/noframes/22186.shtml
Quote:
Originally Posted by gumby79
As to personal experience.
When I installed a MSD 6 Digital ignition system (from a stock HEI) and a RPM Air gap Edelbrock intake (from a stock aluminum) . my vacum went up 2"from 15"mg to 17 at idle (625rpm engine liked 425rpm but the alt. quit below 600rpm and the 800 stall tork converter would not allow a stock750-800rpm idle) and I saw an improvement in mpg of 2.5.
|
So... you were able to idle all over the place while driving? You didn't touch your gas pedal once while driving? I'd hate to have been stuck behind you.
Quote:
Originally Posted by gumby79
(From 7.5 allday every day. to 9.5-14mpgdepending on how I drove.)
This was a 6000lbs tall (24"under the frame) off-road capable 4x4 that was also used to pull a 16,000lbs 5th wheel
More of the right kind of power = more efficiency = better mpg..
Gumby Stay Flexible .
|
I think the confusion is coming from somebody here equating higher idle vacuum with higher efficiency.