I get 11.3 (first tank measured after a motor swap, so I'm hoping it goes up). I'd love to see 14. :-)

I've got one of the Haynes F150 customization books. Lots of pretty pictures. One mod they suggest that I have every intention of implementing is a vacuum gauge. Eyeballing engine load all the time has the effect of making you let off the gas pedal to keep that gauge in the zone where you use less fuel. I figure the install is gonna run me about $60 to make it pretty and do it right. If I can get to the figures you guys are talking about, or even get close enuf to sniff those figures, I'll be completely satisified.

 

Well, only 15.6 this last tank. I had 120 lbs. of softener salt in the bed all week. Kept forgetting to take it out! Don't know if that had anything to do with it or not. I've also been running a little faster on the drive to work also, because I was running late a couple days in a row.

 

oil companies are just now switching to winter blend on the gasoline. plus the ambient temps are now about 45-50 degrees, not 80. What that means is your milage will drop 1.5 - 2 MPG for the winter. Happens every year in the upper midwest. Dont know about the southern states. You dont get 17-18 in the winter, you get 15.5 MPG.

 

The 2010 does have electric fans. Why would they have done that.
Why do you think any racer out there uses electric fans.
Why do you think every mustang for who knows how long has come with electric fans.

You don't know if you could get 19 MPG since you have never tried.

 

I was wondering if anyone else noticed that. I dont know what date they switch but my last two tanks did drop suddenly. I had been getting ~14mpg with the V10 and was pretty happy and the last tank dropped into the 12's. I started logging each fill up about 2 years ago I'll have to check last year when my mpg started to drop. I know when I was in the city my mpg would drop from 14-15 summer to 13's winter (with my 4.2l F150 I mean).

Yep i have if you read my earlier posts... at least I tried no fan at all (should be even better mpg than runnng electric fan). Multiple tanks of fuel and no noticable gain. There are many reasons they have used electric fans. What I am saying is on a truck they arent going to make a 1+mpg improvement. And racers use them since they can control them, you can shut them off for max power and also they cun run to cool the motor after the engine is off. I'm not saying there isnt any advantages, just that expecting a noticable gain in mpg is bs. I am sure the racers put them on there for mpg.

For the record I have got in the 19's. However I never claim that since I cant repeat it easily. To many folks get something a couple times and claim thats waht they get. Not saying that your not averaging that high, its great if you really are (hadn calc of course), but a true combined driving consistantly averaging that high...

 

Yes, I am truely averaging that high. About 10 tank fulls now.

 

Think the main reason for the mileage difference is that you have 2 wheel drive. Right off the bat you had 16.5 where the best I got was 14.

 

03 f150 4x4 4.6L with 33" tires. 3.55 gears. I get 12-14 highway and 10-12 around town. K&N filter, throttle body spacer, and Flowmaster exhaust.

Question? Even when I start my truck, the fan is on. Isn't it supposed to be a clutch type? Is it supposed to go on only when the engine is hot?

Also, I put a flex fan on my old mustang. The angle of the fan blades would lesson with the speed of the engine. Anyone heard of using these on an f150?

 

The fan clutch is based on rpms. After a certain amount of rpms - the clutch will disengage. It has to run at slower speeds and at idle or the A/C condensor would not get air flow and would not be able to cool properly.

Don't know about the flex fan. I do know you can do a single electric 16" fan from autozone and a controller for $100.00

 

Some work on temperature also.

Straight from Wikipedia and I couldn't have said it better.

 

Back up to 17.5mpg without the 160lbs. of salt in the bed.

 

dang, how are yall getting that high of mileage, my 98 f150 4.6 4x4 is getting 10-13 mpg. it pulls a trailer some of the tiime though. but still that dont even compare to 17-18mpg.

 

I try to drive with a steady foot, although with the air cleaner mod and removal of the silencer, it's hard not to romp on it once in a while. LOL
I plan on a synthetic or seminsynthetic oil change, and changing the rear axle lube to synthetic soon.

 

Seems those people have two wheel drive.

 

Going to a synthetic oil such as Mobil 1, will that cause any issues with a motor that has been run on dino oil only? I have 110k on the clock on my 2001 Crew Cab.