Hey Everyone:
I just got back from a trip to see
my brother in VA and I averaged 22mpg
going down to see him. My seceret, I
traveled the speed limit the whole way.
It took longer but I was really surprised.
I own a 98 f150 sc 4X4 ORP 4.6L 3.55 Auto

 

98silverf150

I have the exact same truck, and there is no way I'll ever see 18 mpg, never mind 22!

Are you sure there isn't something wrong with your calculations.....I find it very hard to believe.

But, if you did get that good of mileage, congrats!! (Maybe silver is more aerodynamic then black!)

What kind of mods do you have?

 

It is possible!

I have an acquaintance who used to get 25 mpg with his before he did the Dual exhaust. Now he gets 22mpg.

His is a 97' F-150 Super cab 4X4.

 

I got 19.5 mpg on the way back from Steamboat Springs, CO to Colo Spgs. All mountain driving about 5-7 mph above speed limit. Got 17.5 going up there in high winds. 4 mountain passes each way. Got 20.5 on a trip to Denver and back. This with a 5.4l 4x4 and 245 tires. Just turned 4k miles this moring.

 

The best I ever got was 21 mpg, and I've got a 2wd V-6 with some mileage improving mods! But that was on crappy California gas and driving at 70-75 mph, all highway.

Usually I get around 18; used to get about 16 when the truck was all stock.

 

On a recent trip to Philly, from CT, I got 22 mpg, going 75 mph with the A/C on. I've got a Superchip, a spintech muffler and a JL, ram air. Thats it!! Auto with 3:08's , I went 228 miles on 10.6 gallons. coming home, going 85mph A/C, and with more city driving I averaged 18 mph. Normally I see 16-17 around town.

 

On a trip to do some loging I went 65 and got 19mpg. On the way back loaded with 3/4 ton of wood I got 15.5.
This on a 97 f-250 ld 4x4. So it is possible to get good gas mpg, but the only way I see it is 65 or below.

 

The Only mod I have is the K&N airfilter.
Everything else is stock. 38000 miles.
I just stayed the speed limit....
oh yeah, Torno cover and alot of wax :-)

I think I'm ok with the Calculator.

 

my '99 f150 2wd 4.6 v8 gets between 21&23 mpg , at 100kph .

 

How much sense does this make, I had a 99 F150 Standard Cab V6/auto/3.55 I never saw over 15mpg. Even on a trip across country where I set the cruise at 75 and ran till I was ready for a fillup never touching the brakes or slowing down (driving at night). The V6 was terrible for pulling my boat so I got a 2k Supercab 5.4/auto/3.55 and I get about same city and more mpg hwy. Most I have seen is 19, but its usually 16.5 to 17. Im starting to think there is very little if any mpg diff in the motors.

 

WOW!! I am stunned, I've got a '97 and the best I've gotten is around 14 mpg, and that's mostly highway. I don't know what I'm doing wrong, but I would love to come at least close to 20 mpg. Congrats on the great mileage.