MPG for Ford V10

I run 80 in all 6. (Goodyear 19.5") The sidewall shows 85 or 90+...depending on the year of manufacture. Goodyear apparantly changed something in the manufacturing process, saying the weight of the motorhomes using the 19.5" tires has increased, so they are "answering the call" to to speak.
In years past, the state inspection, I found that when the vehicle was on the brake station...the weight was also recorded. By individual tire, by axle and by total weight. I asked if they would give me a printout, and they did. 3 times. (Now, of course, "inspection" consists solely of emmissions, so no longer can I get this printout.)
Anyway, I called Goodyear customer service once and read off the weights as shown. I told the person I am running 80 in all 6...and was advised that I could even run with LESS air pressure...but if I was comfortable at 80, leave it there. So that's where it remains.
I get 7.3 mpg towing and 7.8 mpg not towing. Chevy HHR= 3400# and the Ford Ranger=4000#. Been down to a low or 6.something and a high of 8.

jerseyjim wrote:
7.3 (towing) is "fantastic"? Well...depends. How heavy is the "toad"? A full water tank has a negative effect (I usually have it filled 1/4 for the toilet, if needed). Propane...should keep it topped off especially during the coler months, but I don't think that has any real affect on gas milage, like the full water tank does. Are your grey/black tanks empty? If not, why not? Tire inflation? Too little...that takes away, even if just abit. Speed: More than 60-65, (on cruise control)...just watch that gas gauge dump. I run around 62 (tach reads 2500 rpm). Any slower on the Interstates, and you're looking for problems. Stop and go...traffic...eats it up. Can't help that....

Just my opinions...FWIW.

JerseyJim,

My black and gray are empty, the water is under a 1/4, the tires are filled according to the manufacturer's recommendations for the weight. I drive generally between 60 and 65, usually 63-64 on cruise. I have a 5-star chip tune so the transmission stays in gear longer and doesn't drop to 3rd and scream at 5k going uphill. My tow is a Jeep Liberty, under 4500 pounds. Over 20,000 miles, I have logged every fill and every mile. So I am at a loss as to the mileage reported by all the others. One interesting thing is that from central NJ to Harrisburg is my worst mileage. I think it is the frequency and length of the hills on 78 that screws with my mpg. As an example my 4 tank average on a trip to and from Kentucky was 6.6, the best tank on that trip was 6.9. What tire pressure do you run?

Sorry if my math is off a little but some times I ran the gen set for air and some times not and I try to figure each tank as I fill it up and I had some tanks I got 7.8 mpg and some 7.0 and the lowest tank was 6.8 in Smokeys. So I tried to average each tank was around 7.2 to 7.5 . Again sorry the math was a little off.

The one thing that I have noticed in reading all the various post on V10 mileage is the difference between older units and newer units. I think if you do the research you will find the newer coaches are bigger and heaver than even 10 years ago. Every one wants more and more slides and amenities. If I had the time and interest to do the research just how much heavier the average 2014 coach is over an average one from 2000.
The one mod to this setup that seams to help mileage is the transmission controller that reduces the early down shift by the transmission.
Bill

My '05 V-10 got 9.25 mpg pulling a trailer and motorcycle at 55 mph. My '11 gets 8.05 pulling same trailer. Difference is 4000 more lbs, not broke-in and a more blunt front end. Same driving techniques. Trying to get it up to 8.5 which means a $1400 savings over the next 50k miles.

7.3 (towing) is "fantastic"? Well...depends. How heavy is the "toad"? A full water tank has a negative effect (I usually have it filled 1/4 for the toilet, if needed). Propane...should keep it topped off especially during the coler months, but I don't think that has any real affect on gas milage, like the full water tank does. Are your grey/black tanks empty? If not, why not? Tire inflation? Too little...that takes away, even if just abit. Speed: More than 60-65, (on cruise control)...just watch that gas gauge dump. I run around 62 (tach reads 2500 rpm). Any slower on the Interstates, and you're looking for problems. Stop and go...traffic...eats it up. Can't help that....

Just my opinions...FWIW.

I won't say that I don't believe you all and your fantastic mileage. I can tell you that after three years and 20,000 miles I have an overall average of 6.34MPG. This is towing, not towing, shot trips and longer ones, fairly flat ground and hills. How fast are you all driving? do you only drive downhill with tail winds?

Most of you do far better than I do on mileage. Florida to the Blue Ridge mountains, averaged 6.3 MPG. I was running between 67 and 70 MPH, towing my Jeep TJ with full water and propane tanks.

We just returned from a trip to the NW. Quite a few hills and mountains to go up and down. We used 818 gallons over 5122 miles for 6.28 mpg. I set the CC at 58 on 2-lane roads and 63 on 4-lane roads.

pkunk wrote:
I think the earlier V10s get better mpg as I have averaged 8.2 over the past 9k miles.....

I agree. The first full size RV after the years with a Toyota Dolphin was an '02 Coachman Class C. We normally averaged just over 8.5 with a high of 10.2 on the last half of a return trip from the UP to Vegas. At that time we were not dragging a toad. Haven't done any traveling in the new Itasca Sunstar 35F, so guess we'll see soon enough.