Re: Fuel Milage Hills vs Flat Land Reply #20 – June 11, 2015, 09:07:07 am Quote from: Dave M – June 11, 2015, 12:08:19 amI had a good feeling about that Sandstone Mtn I-64 grade, yes a good pull, my toy will hold 57 mph up that mountain until the last 1/4 mile, it drops to 56, Yup the 500 setting, resonator when pulling the toad does good. Fuel mileage, that is what it is, I hear everything up to 18 mpg, Who really cares ?We seem to end up closer to 50 at the top of that mountain and that's fine with me, since we're not struggling and overheating as do many typical gasoline motorhomes. Our Cummins may have only a 400 Hp/1350 lb-ft rating, but it's perfect for us. Gotta' love our old Foretravels!!Many people like to talk about the "real" mountains in the West, but we do have some significant steep and long grades in the East. Quote Selected
Re: Fuel Milage Hills vs Flat Land Reply #21 – June 11, 2015, 09:32:13 am Quote from: John/Pat – June 10, 2015, 08:43:58 pmI start out trying to get the best mileage by driving 60 but after an hour of getting run down by every semi on the road; I go into the 75-80mph mode. ....... I sure would like to have Dave M set up.Change the rear end gears, 82mph around 1950rpm. a nice 75 right around perfect 1800 Quote Selected
Re: Fuel Milage Hills vs Flat Land Reply #22 – June 11, 2015, 01:40:43 pm Well, I had a headwind today and I dropped to 7.9 mpg over 150 miles then I pushed it to 68 and I dropped to 7.7 but the wind had died down. When I leave I will be in the mountains so mileage will be what it is. Hammer up and run down. Quote Selected
Re: Fuel Milage Hills vs Flat Land Reply #23 – June 11, 2015, 01:55:34 pm The front design of the GVs does make a difference in fuel mileage. NASA has even codified it (Shape Effects on Drag). We don't do long trips without the Jeep behind us and since only long trips gives you enough data to get a reasonably good idea of mileage we only have short-trip data for no-toad trips. But we averaged 10.4mpg driving about 2,000 miles from central WA through the Columbia River Gorge to Portland, OR and the I-5 and US-99 and CA-41 up to SKP Park Sierra. So a mix of mountain and flat. I could have done better but I got carried away with the way the Banks system pulled us over the hills and around the trucks. Craig Quote Selected
Topic: Fuel Milage Hills vs Flat Land