Larry196 Report post Posted August 22, 2012 We just bought a '06 HR 40 foot, with a 400 Cummins. The coach weight is 33,000 and we plan on towing a '13 Kia Soul, 3,700 lbs on a tow dolly. I have heard we can expect between 6 and 15 mpg. I have never had a diesel so I have no idea who to believe, but I know I can trust people on this forum, that have done the traveling. What kind of fuel mileage can I truly expect ???? Larry & Rita F428262 Share this post Link to post Share on other sites
desmo Report post Posted August 22, 2012 We had a 40' Charleston with Cummins ISL 400, the coach weighted 32,000 and averaged about 7.5 mpg. Share this post Link to post Share on other sites
hermanmullins Report post Posted August 22, 2012 Larry, congrats on the new coach. We have 02 Monaco (40') with the Cummins 400 ISL. We tow a Chevrolet 1500 Extended Cab 4 down. I would believe 6 and love to get 15 but that ain't goin to happen. (unless you can travel on a road that goes down hill for 4 or 5 hundred miles). We get 6.5 to 7 MPG on a steady basis. Good luck and enjoy your new rig. Herman Share this post Link to post Share on other sites
kingfr Report post Posted August 22, 2012 Be happy with 8 MPG, expect about 7 depending on how heavy your foot is! Share this post Link to post Share on other sites
CrazyCruzers Report post Posted August 22, 2012 We got our Itasca Meridian 36M earlier this year. A couple of short weekend getaways gave us around 8 MPG. This summer we traveled to the WIT GNR in Forest City, IA. Overall mileage for the 4000 mile round trip was (to me) an astonishing 9.2 including running the generator for the house A/C and towing a Jeep. We usually cruise at 5 below the limit. Share this post Link to post Share on other sites
akadeadeye Report post Posted August 22, 2012 Be happy with 8 MPG, expect about 7 depending on how heavy your foot is! Agreed. I would only add, when towing, accept 6.5. Speed, climbs, and wind are enemies to mpg. Especially speed. I notice a significant difference between 60 mph and 65 mph. 60 mph gets (for us) at least 1/2 mpg better mileage when towing. Use of the generator will alter results somewhat depending on usage. You just bought a 40 ft. motorhome rig with a 400 hp diesel engine (and a good one) pushing 33,000 lbs. . Don't sweat the mileage. It is what it is and it is not good. Whomever told you over 10 is smoking something they shouldn't be smoking. I figure it costs about $0.40 to $0.50 per mile for fuel. Add in all the maintenance, storage, insurance, etc. and...............I don't want to know the per mile cost. Don't anyone tell me. Don Share this post Link to post Share on other sites
hermanmullins Report post Posted August 22, 2012 I have made it my choice to never worry about MPG or if I have to pay too much for fuel during a trip. If I do it ruins the trip for me. The time I get up tight is when the Visa bill comes in. That is when everything come together. Don't get me wrong I do try for the best fuel prices but still don't let it get me down. Have some good trips and worry after the bill comes in. Herman Share this post Link to post Share on other sites
vsheetz Report post Posted August 22, 2012 15 mpg? Maybe downhill with a strong tailwind, otherwise, no,,, Share this post Link to post Share on other sites
five Report post Posted August 23, 2012 High 7s to low 8s with our 400 ISL. Biggest detriment to fuel mileage is a heavy foot and head winds. Share this post Link to post Share on other sites
danwright7@mac.com Report post Posted August 23, 2012 Hi Larry, the first thing is dont use a car dolly! 2nd is I have a 2012 Dutch Star with a 450hp. Cummins and I average 8-12 MPG traveling at 60 mph (1500 rpm). Share this post Link to post Share on other sites
bizsmith@yahoo.com Report post Posted August 24, 2012 99 monaco exec. Seems like I always get 8 mpg. Share this post Link to post Share on other sites
OLDMARINE Report post Posted August 24, 2012 Congrats to Your New Coach. We have a 04 Alfa Gold 40 ft with a 400 Cummins , approx,33000 lbs ,towing a Nissan Maxima on a tow dolly. Just completed a 7800 mile trip, averaged 8.1 mpg, keeping the speed at 62-63 at 1600-1650 RPM. Good luck and god bless. old Marine Share this post Link to post Share on other sites
