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Drop in fuel economy

Drop in fuel economy

Postby ThaDoubleJ [OP] » May 05 2021, 6:00pm

Noticed over the winter a slight loss in fuel economy and chalked it up to warming the truck up before driving it. Today it's 60 out, took a 100 mile highway trip, and netted 14.9mpg. I generally average 15.3 hwy/city. That's a big loss. I also noticed that my front rims/hubs/lugnuts were stooooopid hot, roughly 11,000 degrees after the truck had been parked for about 15 minutes.

Truck doesn't pull, doesn't feel slow, doesn't exhibit a stuck caliper symptom. Is anyone aware of an issue that would affect the entire braking system and have the pads riding a bit more than they should on the rotors?

Rear wheels/hubs were luke warm, and my drums are properly adjusted within the last month or so.
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Re: Drop in fuel economy

Postby Bradley21sanders » May 05 2021, 6:08pm

.4 mpg is not much. You can take the wheels off and check the slides on the caliper, but that area is typically hot after trips.
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Re: Drop in fuel economy

Postby tsuintxtsuintx is online! » May 05 2021, 6:32pm

I tend to agree with Bradley above. 14.9mpg from a 6.0 with a cam isn't bad at all. Less than what you've used to, I guess, but still not bad.

But if the wheels were really that hot (as in really hot), then it sounds like something is binding there and you need to take a look at the calipers and/or bearings and see if anything is amiss there.
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Re: Drop in fuel economy

Postby shakenfake » May 05 2021, 7:13pm

He went from 15.3 in the CITY to 14.9 on the HIGHWAY. I’d say that’s a drop that is considerable.
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Re: Drop in fuel economy

Postby badbruin44 » May 05 2021, 7:25pm

You have to check temp measurement 11,000 degrees is not right s^%t steel melts at 3500 degrees you would have just a pile of melted slag if it was 11,000 degrees?
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Re: Drop in fuel economy

Postby JL8Jeff » May 05 2021, 7:39pm

Winter gas always causes a drop in mpg. My T*** would go from 17+ mpg in the summer to 14 mpg in the winter. I think the summer gas will start to show up within the next month, but I don't think it's here yet. I could tell last month my T*** went up to 15.1 mpg on the last tank but I think that was just the warmer weather.
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Re: Drop in fuel economy

Postby ThaDoubleJ [OP] » May 05 2021, 9:41pm

I've got to make the return trip here in a couple hours, I'll do another measurement of MPG and shoot my bearing caps with a thermal laser measure and report back.

Just to clarify: Usually seeing 15.3 combined city/hwy since I put the engine in. Noticed a decrease (but didn't pay much attention) mid-winter, so I reset the AVG MPG readout and it's never broken 14 combined hwy/city since. Reset again today as I pulled onto the highway.

I do know that at 60mph I get bad mileage, at 70mph I get worse mileage and at 80 mph I get worst mileage. My highway trips are generally a mix of all three speeds as I travel from rural to Denver to rural again.

These are all computer generated MPG figures. I tested the computer against my calculator once, it was within 2 or 3 tenths, so I called it good enough.

Bruin, 11000 degrees was an exaggeration.
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Re: Drop in fuel economy

Postby Bradley21sanders » May 05 2021, 10:07pm

ThaDoubleJ wrote:I do know that at 60mph I get bad mileage, at 70mph I get worse mileage and at 80 mph I get worst mileage.


:lol:

Right mine is only a 5.3 and I go from 16 to 14 to 12 at those speeds respectively.
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Re: Drop in fuel economy

Postby ThaDoubleJ [OP] » May 05 2021, 10:29pm

That 4.56 gearset might have something to do with that....I may check out your tutorial, wouldn't mind some 4.10s or so to offset our lack of oxygen up here.
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Re: Drop in fuel economy

Postby khoysagk » May 05 2021, 11:25pm

shakenfake wrote:He went from 15.3 in the CITY to 14.9 on the HIGHWAY. I’d say that’s a drop that is considerable.

Actually he should get better mileage on the highway than in the city, not vise versa.
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