This site may earn a commission from merchant affiliate
links, including eBay, Amazon, Skimlinks, and others.
I can regularly achieve 14.5 - 15 mpg on combined stretches of long uphill and long downhill.
Your first leg from Moab to Flagstaff has a 2,500 ft. elevation gain, and it appears you were not driving extensively at 70+ mph given your average speed. I typically end up between 13.5 and 14 mpg in these conditions.
Your second leg is from 7,000 ft. down to close to sea level. On my last trip from Winter Park to Denver, which is 8,600 ft over a 12K ft pass and then down to 5,500 ft (with some additional large ascents/descents) I averaged 17.5 mpg. The climb back to 7,400 ft. reduced total trip economy to exactly 15 mpg.
I had four kids, two large dogs, a completely loaded roofrack and all the other good stuff from a week long ski trip. Highway speeds of 65-70, average trip speed given the pass miles was ~55. 37" tires, AWD.
So no, I don't think it improved your fuel economy, but I'm glad you felt like it did because seat of the wallet results are alway important for the first few months after you complete them
I know, I was just being the judge
I dont care at all about mileage I did for part time not for gas savings, my post was information purposes only.
You would want the information to be valid and significant, no?
To do so you would need to run the same course under the same carefully controlled conditions with a more accurate means of determining the fuel used to get an accurate comparison.
Otherwise, you would need to make many measurements with and without full time 4wd to be sure you have a statistically significant difference. Excel has a statistical package built in.
Nice MPG Phil
At 4.00 plus dollars per gallon, it shouldn't take you too long to recoup your investment.
Alluding to murf's post:
What was the cost to fully convert over to part time (parts and any labor you paid)?
I know you didn't swap over with the intent of improving mileage, but it may be good information for people who are interested in doing this for economy reasons. Knowing the real world numbers may be surprising to some.
Thanks you for your input. Im sure other would like to hear more on your technique in order to achieve that kind of mileage consistently. With 37's and 5.29s gears can you pull hills at the posted speed and still get those numbers?
To add more info I tend to drive with the no pass style. I try to run at the posted speed limit. With stock gears I find my rpms at 4000 rpm on steep hills with peaks up to 4500 at time. Without gears I find this necessary.