What are the tips you are following in order to save fuel?

[JumboJet]

I have a Scan Gauge and watch the boost reading. The higher the boost the more fuel I am burning.

Unless I have a need to be somewhere at a certain time, 67 MPH with no headwind is the sweet spot for my Cummins.

[TonyDi]

Minimize weight. Avoid full H2O tank unless necessary. Remove anything hat is dead weight and seldom used. Under-inflated tires on the MH and the toad don't roll well so make sure they are at the correct pressures.
Plus the above!

[rgvtexan]

A rubber ducky with a squeaker! Put it behind the petal, if it squeaks when you push, back off and push slower. Drivers ED 1957.

[ultra]

Originally Posted by Stealth01

In addition to the above, find your "cruise sweet spot", on our Cummins 500 ISM it's ~1,350 RPM @ ~61 MPH. Engage the "Mode" switch on your transmission selector panel and maximize the use of cruise control.

What is the purpose of the "Mode" button on the transmission selector?

[barmcd]

It doesn't seem like anything I do makes an appreciable difference in mileage except driving slower.

[DD788Snipe]

Originally Posted by DGBPokes

Sounds good to me....how do I find the " sweet spot" on a Cummins 350 ISL

The sweet spot on your rig is 62 mph @ 1800 rpm. I get around 8.5 to 9 mpg in that range and drive with my cruise control except when I'm in city traffic. I did have my ECM reflashed to increase the HP and torque. That helped pull the grades better but I still get about the same mpg as when I had 350 HP. My torque went from 1050 ft/lbs to 1200ft/lbs. that was the difference.

[spsm]

Hypermiling....................try it sometime.

[VSPA]

Often discussed subject and I read through them every time I see one. We've a 2014 Itasca 35F and the only time I checked the mileage on it was during the 2500 mile round trip of our maiden voyage towing the wife's Focus on a dolly. Got 7.5 mpg. I use most of the suggestion above that will apply to a V10 gasser, but the things I have found that gives the best results and feeling of road safety is using the cruise control and keep it at 55-60 (mile per minute) or below and accelerate at a moderate pace and I keep a pancake compressor in a storage bin and check the tire pressure prior to each trip. Also, approximately every 2.5k miles I'll add a couple of bottles of Lucas fuel injection cleaner. Even at that I don't think I will ever get up to the 16-18 mpg that I got out of our first RV, a 1987 Toyota Dolphin. Comfort does have it costs.

[Mudfrog]

Originally Posted by barmcd

It doesn't seem like anything I do makes an appreciable difference in mileage except driving slower.

This is our experience as well. Hard stops and quick take offs do use more fuel but the big thing is driving anything over 65. Haven't plugged the scan gauge into the MH but for grins, i think i'll do that the next time we're on a trip. For now, around 55 seems to be good with us getting a bit over 9 on relatively flat ground with no toad.

[Crossingover]

Above about 50 mph overcoming aerodynamic drag consumes more engine power to push forward so I'm waiting to see someone market an RV air tab kit similar to the air tabs you see on some tractor trailers (e.g., beneath the trailer and around the rear doors). I'm sure some of the aero research and devices for tractor trailers would apply to MHs with the corresponding savings in fuel.

[mel s]

Originally Posted by DGBPokes

Sounds good to me....how do I find the " sweet spot" on a Cummins 350 ISL

DGBPokes
Call Cummins Care at 1-800-343-7357 with your engine serial number and ask...(nobody knows more about your particular Cummins engine than Cimmins Inc.).
Mel
'96 Safari

[LETMGROW]

I use my cruise control quite a bit but when I see a long grade coming up I disengage the cruise, accelerate slightly and let off the throttle as necessary to maintain a reasonable speed without the transmission shifting down too many gears and allowing the RPM to rise sharply.
I do the same when driving a truck with a heavy load or towing a trailer.
I stay to the right so I don't stall traffic out behind me.
Lynn

[Crasher]

I have tried and used all of the already mentioned practices. I have found that on a long trip, the rate of acceleration has little effect on the overall economy. Probably because there is so little time over the course of a day that the coach is acceleration mode. At the end of the day, I doubt that the difference between getting up to speed fast or slow can be measured in overall fuel consumption. The things that work for me are a steady moderate speed of 62 mph, (55 is better, but I just can't drive that speed for 10 hours), proper tire inflation, slowing and coasting to a stop rather than braking, avoid days with strong head winds, (there is always a head wind, but some are stronger than others), and not letting the engine idle longer that it takes to get air pressure up. I also shut the engine down as soon as I get to my stop. At 50,000# total weight, Removing 1000# of water and unneeded items won't make a difference, so I go with whatever we have at the time.

If fuel efficiency were my top priority, I would be driving a small class B van conversion with a Mercedes diesel getting 20 mpg instead of 7. But then I would have to make too many trips to take everything.

[Coma]

As a general rule you will obtain your best mpg at a couple hundred rpm above torque peak, assuming you have enough horsepower in your highest gear to do that. On the same vehicle worst operator to best operator can vary as much as a 30%.