Fastskiguy

It seems like the big tires drop mileage but I would think that in some cases they'd help because they'd give a taller "effective gearing". Wouldn't a bigger tire roll easier too?

bulldog150

At highways speeds you may get slightly better gas mileage on a straight plain because your rpms are lower at the same speed. However city driving will be lower mpg because the truck has to work harder to get upto speed.

engineermike

I think a lot of people fail to correct the odo for the tire size, too. That would show worse mileage than actual.

Ricktwuhk

So on my trip over just over 700 miles I got mid 18s, near 19mpg with my 5 liter. On the way back that 5x8 trailer "lightly loaded" turned out to be more heavily loaded, and then there were those 50+ mph winds that were sideways and then hitting us head on. Overall mpg fell to below 12 on the return trip, and at 70mph cruising the truck wouldn't leave 5th gear for 6th due to the headwinds. As soon as we hit a sheltered spot, the truck would upshift and be fine - then drop back down when the headwinds hit.

missionman

120 miles in the Adirondack mountains (whiteface, lake placid, etc). 1/2 tank of fuel, 400lbs cargo

Fastskiguy

4x4 w/5.0 in those hills, 20mpg is really excellent

missionman

Very happy with the trucks performance

13seth

My 2011 fx4 screw echo boost with 13,000 miles. 3.73 rear. I took a couple long highway trips this week. I am pretty consistent at 17.2 mpg at 70-75 mph. I just put a backflip cover on and it seems to have helped a bit? I was pretty sure the covers don't make a difference so I could be mistaken.. This is in CT with 10% crap ethanol 87. Can't get non ethanol in CT

rmorris1953

Reading these post I notice most that are disappointed with gas mileage have 3.55 to 3.92 axles. The EcoBoost has more pulling power than all the others combined. I don't think IMO it is necessary...

I pull a utility trailer 1/3 of the time weighing in from 5,000 lbs empty to 8,000 lbs loaded. I pull a 31 foot fifth wheel (Rockwood 8280 W Dry weight 7,300 Lbs) I came out of Las Vegas pulling Utility trailer loaded with a combined weight of 13,200 lbs. I drove 1100 miles mostly on I -40 going east to Wichita Ks. Pulling the mountains I never lacked any power. I passed everything on the road. Running 70-75 mph. I averaged that trip 12.4 mpg. Also has been the best I ever got pulling.

Going to Las Vegas (Wichita Ks Via Lavern CA had to pick up trailer) I went I-70 from Denver and averaged 21 mpg.

At 75 MPH I tach about 1800 to 1900 with 3.15 axle. Stock tires were Hankook 235/75/17's. I got 80,000 Miles on those tires. A friend of mine got a new truck and sold me his 265/70/18's. My mileage suffered about 3 miles to the gallon.

I almost went for the Ram 1500 EcoDiesel. Almost!!!!!!! You can not configure a Ram 1500 Quad Cab with the same payload, the same max tow, or combined curb weight as a Ford F-150. You can not pull legally the same. I was excited about the Ram 1500 EcoDiesel (Good Luck getting 1 soon and at the same price as a Ford F-150) Then I was reading about a test pulling a trailer with the Ram 1500 Laramie loaded up the grapevine in California. Don't remember what the weight was but they said it was hard to maintain 50/55 mph pulling the 6% grade. And that was probably with 3.92 rear end.

Tuesday I pick up my New Ford F-150 Supercab 4X4 XLT EcoBoost 3.31 axle.

$6,000 less than a Ram 1500 EcoDiesel with the same equipment.

Ram 1,299 Payload F-150 Payload 1,660

Ram 6,501 T/Tow F-150 T/Tow 9,400

Ram 13,500 GCWR F-150 15,100 GCWR

I am sure all the Ram Guys out there are going to have egg in their faces. LOL

Can't wait to see them chugging down the road. Pissing about how high priced Diesel is. Low mileage and no power. But then they can only haul 1/2 the weight as a F-150 they just might do better. Empty they may do good. But why go with maybe at those prices.

Jus Jim

2013 XLT Supercab 4wd 5.0 with 3.55 gears 275/65/18 tires.
City driving 16 mpg.
Have not done any highway driving yet.