Joewee3.5

Trip to San Antonio was 18.3 mpg. Coming home was 17.5. Mixed driving from 55-75 mph. My highway mpg seemed low though. 16.8 mpg @75 for roughly 100 mile test stretches with no stops. Truck is EB, 3.55 gear, 4x4 7000 miles. Do I need to check into whatever flash everyone is talking about?

BoostedXLT

For 75mph, 16.8 is realistic. Keep it under 60 and you will see great numbers. Ive seen 23.8 for over a hundred mile stretch going 60mph. The flash shouldnt change economy, only driving style will change that.

Joewee3.5

I know these trucks are touchy on mileage. I've tested several mph ranges for the best. On a 6-7 hour drive i'd rather go 75 than 60. I know that 75 isn't ideal for mpg but I posted the results because I've seen some ridiculous posts about 19-20 with cruise set at 75. I guess I need a tailwind and whatever hill they're driving down.

PawPaw

These truck's have a lot of wind drag over 70 mph. My truck get's great mileage if I can keep it in the 60 to 65 mph range which is hard to do on a 70 mph interstate. I can still get up to 19 mpg @65 mph with a 5.0 and 3.55's with 33's and leveled. Running 75 mph I'm down in the 16's. Flat highway's in Louisiana help too!

altgilbersnick

what "flash" are you referring to? Sorry, I'm new EB owner

borjeb

If your truck is built before may or sometime near there it has a flash available which changes lots of stuff but most importantly a rough shift issue

matt99

OP, are you from Shreveport? Im from Blanchard

Whiteghost

I live in Monroe,La just went to Jackson,Miss. I ave. 18.7 running 75 sometimes 80. I have 5.0 with 3.73 gears 4x4 screw.

Al Kohalic

That mpg is about right for that trip. I have a Screw 4x4 EB with 3.55 and I just went from San Antonio to Houston and back this weekend. I went I-10 and got 18.6 going to Houston doing 70 Friday night. That stretch of I-10 is nothing but hills. When I got up the next morning to go to Plantersville, I reset my MPG guage. The south east part of Houston to Plantersville is about 90 miles but it is mostly flat. I did mostly 70 with a few 65 mph zones on the highways with a few stop lights and got 21.8. It's all about the hills. I got about the same mpg from Plantersville back to Houston later that day. Today, on my way back to San Antonio I got 17.7 doing 75-80 with nothing but hills.

The one good part about the EB is not once did it drop a gear or loose MPH going up those hills like most of the other cars on the road. My cruise control held a firm 75 accept for the 10 times I increased speed to pass heavy trucks a little faster. It was very funny and nice to see a few cars that just passed me on the flat leading to a hill loose speed and drop behind me going up the hill and the EB never even showed the slightest sign of stuggling or dropping speed. I heard a few Chevy, Ram, and other Ford trucks that had to drop a gear or two just so their cruise control could keep pace going up the hill. Or that is what I thought what was going on with all the noise their engines where making.

EDIT: I forgat to mention I just installed an Air Raid intake last Thursday so I might be getting a little better mpg then normal but not by much.

EricTheOracle

I get mileage like you do with the same set up. As an experiment, Friday night I set my cruise at 55 mph in a 55 mph zone right after filling up and resetting my trip and for 20 some miles I got 24 mpg according to the built in computer.

This confirmed for me that the truck can get good mpg so long as the turbos aren't spooled up.