When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Did you have a strong tail wind to get that 24+ mpg?
24+ mpg at 70mph is about as good as it gets.
I hit 25 mpg a couple times but was trying really hard to do it by long coasting to stops and up hills on 45 mph country roads.
Yeah, i also noticed mpg has been noticeably better with the Summer blend gas.
When auto manufacturers determine their mileage ratings, i'll bet they use Summer gas. lol
It was more of a cross wind on the drivers side for 90% of the trip, then for the 10% was at my back. I attribute it to finding the right trucks to get behind and using the Adaptive Cruise to stay in their zone legally. Flatbeds are the best to get behind.
Gas mileage observations of my 2019 3.5 Eco STX Supercrew with 93 octane gas. Topped off the tank with 2 extra clicks on the nozzle each time. One passenger in vehicle...
Test 1....Cruise control driving 55-63 mph on interstate 25.6 mpg calculated, gauges showed 25.1 mpg
Test 2.... Cruise control driving 68-73 mph depending on traffic...23.5 calculated gauges showed 23.2 mpg
Test 3... No cruise control interstate driving 65-78 mph...21.5 mpg calculated gauges showed 21.1 mpg
Test 3.... City driving 25-55 no cruise 17.6 mpg
Will try the same test with regular gas soon.......
I have 2015 5.0 Lariat with OEM 20's and mostly highway driving in Texas between 70-80mph I get about 18.5-19.0 mpg with cruise control. We have a toll-road with 85-limit that I cruise at 90 and the numbers drop off, but it's a great drive.
Last edited by F1FIFTYM@; 05-19-2019 at 05:28 PM.
Reason: addition
Just did a trip last week from east of Cincinnati to Minneapolis Mn. for a college graduation. With some pretty nasty cross winds both coming and going averaged 19.5 mpg. Did the speed limit 70 miles per hour.
After removing my winter traction load (4 sacks of sand) and filling up, I'm finding that so far this week the average is at 17.5 MPG. My commute is 23 miles each way, with about 5 miles at each end being 25-35 mph with signal lights, the middle 13 miles freeway. My best on a road trip was 20.3.
Just last night, coming up I-95 from Rocky Mount, NC to Richmond, VA, cruising at 70 mph, with the truck fully loaded, including a pair of generators, etc, I was getting 16.7 mpg. My truck has 3.73 gears and HDPP and brand spanking new LT 245/75R17 LRE BF Goodrich All Terrain KO2 tires.
I will say, my truck really drinks gasoline above 65. If I had stayed below 65, I'd have gotten another 1 to 1.5 mpg, and if I were below 60 it would have really gotten better, maybe 19+.
Just last night, coming up I-95 from Rocky Mount, NC to Richmond, VA, cruising at 70 mph, with the truck fully loaded, including a pair of generators, etc, I was getting 16.7 mpg. My truck has 3.73 gears and HDPP and brand spanking new LT 245/75R17 LRE BF Goodrich All Terrain KO2 tires.
I will say, my truck really drinks gasoline above 65. If I had stayed below 65, I'd have gotten another 1 to 1.5 mpg, and if I were below 60 it would have really gotten better, maybe 19+.
what trans do you have? do you lock out the top gear(s)?
I started logging my fill ups using Fuelly, at around 7800 kilometers.
$5002 worth of fuel, & averaging 14.0 Liters / 100 km. This is 16.8 US MPG or 20.2 Imperial MPG. I have 37,390 kilometers on the vehicle now.
I always reset the trip meter. sometimes the computer display is bang on, but it will vary +-. 4 l/100 km. This is after I adjusted the factory settings, to calculate it more accurately. It used to show quite a bit better fuel economy on the dash display, than what I was hand calculating.
I also have the Max tow pkg with the 3.55 diffs, It is the supercrew with 6.5 box 157 wheel base.
I haven't used it much for pulling anything, but do notice that fuel economy takes a hit just putting an ATV in the box.
The best I have seen is 12.4 -12.5 l/100 on a half a dozen fills, & the worst has been around 17.7 (13.3 - 18.8 US MPG)
Most of my driving is highway, very little in town/ city driving or stops.
04-30-2019, 10:26 PM
