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OK - I did the numbers for my 4.0 Ranger. Ran the same road twice - same numbers. At 100kmh in 5th I'm at 2200RPM doing44mpg on the down grade. In neutral at 2200 RPM I'm doing72MPG, with it at 1100 RPM idle I'm doing 144MPG
Then I decided to check the GPH at different speeds with the AC on or off. The AC has an automatic adjusting orifice installed - otherwise it's a 1993 Ranger system converted to R410 and bolted on with only a switch for control.
With the battery fully charged (no alternator load) at 900rpm I got .28gph. At 1500RPM it was .53gph and at 2000 RPM it was .73gph
I the turned on the AC and got .75gph@2000, .53@1500 and .30@900RPM
You can do with the numbers whatever you like. They are worth at least what you paid for them - - -
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