GEN 1 Lower than normal MPG?

[Ruger]

Check the plug wires, make sure none of them are loose, check the plugs and make sure they are tight.

Won't the truck throw codes if a plug or a wire fails?

 

[Ruger]

I think the before tune up mileage was wrong. Very few 6.2 Raptors do better than 12-13mpg average.

Then mine is one of the very few.

 

[Canuck714]

You are a lucky one Ruger...
I have had 3 Gen 1's and none Averaged 15... Can I see it on the highway, sure, but town will kill it again.lol
When brand new, my 13 on stock wheels /tires averaged 13.9- 14.1 for its first 6 months, then got 35 Toyos and mid perch and never saw above 13 for an average.
My 14 Roush on 37's was a solid 14 after the JDM tune. Before it was happy to see 12
The 11 that has all the built suspension on 37's is 11.7 to 12.4 all the time.

 

[Ruger]

Won't the truck throw codes if a plug or a wire fails?

@FordTechOne , would you kindly respond to this question? I'd appreciate it.

 

[FordTechOne]

@FordTechOne , would you kindly respond to this question? I'd appreciate it.

Sure. It will only set a DTC if the plug or wire is damaged or worn enough to cause a misfire. The PCM doesn’t monitor the secondary side of the ignition system.

 

[Vash]

The Gen 1 was only rated up to 14 mpg highway. While folks have gotten higher than that, it’s unlikely you were getting better than the rated fuel economy with heavy aftermarket front/rear bumpers and wheels/tires.