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Old 12-19-2010, 08:18 PM
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HoustonHemi HoustonHemi is offline
Dodge Ram Forum Senior Member!
 
Join Date: Jan 2010
Location: Texas!
Age: 49
Posts: 707
Gender: Male
Vehicle: 09 Ram 1500 Reg Cab SB
Trim Level: SLT w/5.7 and 3.92
Color: Black
Engine: 2009-2010 345ci (5.7L) Hemi V8 390hp 407lb/ft
Rep Power: 5
Rep:112
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My little RCSB gets 20 most of the time on the hwy driving 70 or less,,, It took about 15,000 miles for it to loosen up before it would do so!

Highest ever was 24.5 per EVIC. Went about 15 miles on the Beltway with a strong tailwind. Ran in 4 cyl mode continuous for all 15 miles.

I've disabled (turned off) the 'fuel saver' light because ever since the last dealer 'flash', it comes on A LOT, even when I'm not in 4 mode.

In order to know I'm in 4 mode, I use my Cortex to moniter intake manifold pressure and throttle percentage. The pressure lets me 'see' if I'm in 4 mode, and keeping the throttle at 20% max kept the pressure up (Pressure drops off 'significantly' when all 8 intake valves are opening)

About 90 is the max pressure I can run in 4 mode,,, Add any more pedal, and it kicks out of 4 mode. Runs about 50ish or less w/ all 8 cylinders running.

Once I'm in 4 mode, (in my truck with my gears), I can pretty much stay in 4 mode forever as long as I don't exceed 20% throttle.
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