RPM's and milage?

[93 W350 LE]

What rpm seems to get you the best milage with your automatics?
Do they seem to get better mpg's when you cruise above the stall speed, or lower in the range?

Thanks for any replies.

Eric

[RCCUMMINS89]

Depends a lot on pump tuning and mods...........

HOWEVER, in a stock or close to stock truck with "small" injectors.......lower the better.

From everything I've been around with the above.........1650 seems to be pretty sweet.

Now, if you have a truck like mine (loads of timing, huge injectors) rpm doesn't really affect it that much. More or less strictly speed. (above 75 wind resistance and just straight hp takes to move my heavy butt takes over)

[simplysmn]

Well with my Crewcab 410's and 37's 366 spring fuel pin and a HX35 with a 16 housing,star wheel down some smoke screw in some , It loves to run about 1800 to 2000 rpm's and roughly 17 mpg maybe 18 .With the Pedal Burried on the floor it will run 2200 all day long at just a Hair over 100 mph

[93 W350 LE]

I am hoping to be able to haul my 14k# 5th wheel, and be able to stay above 10mpg. Hoping...


Eric

[simplysmn]

You shouldn't have any troubles doing that .

[1STGENFARMBOY]

If you have 3.54 gears you can pull in 3rd at 55-60 and get 12-13, it won't change much in OD but your trans will build a lot of heat.

I would put in a trans temp gauge with the sensor in the pan, if'n I was you.

keep the temp under 200* and it will last lots longer.

[93 W350 LE]

Sometimes wish I had 3.54's. 4.10's with 235/80 16's spins some rms. Trans temp gauge and aux cooler I think will give me more peace of mind. Looks like this will be a long 60mph trip.

Eric

[BILTIT]

Get taller tires if you can fit them.

[93 W350 LE]

Get taller tires if you can fit them.

That has crossed my mind, but just put four new ones on this year.

Eric