Just curious, does anyone know the difference in gas mileage after installing a spray-in liner? I am sure the weight added will affect the mileage a bit, but I am wondering how much.

Getting my F-150 with a V-8 Automatic, and already looking at add-on's for it.

Hoyoman

 

.0005679 miles per gallon

 

Wow, I would have thought the added weight would have taken the mileage down a bit more. Do these actually not weigh that much?

Thanks for your reply.

Hoyoman

 

Well, actually it's closer to .0005681.

I calculated it based on 10 lbs costing 1 foot of distance traveled.

I allowed about three gallons of goop for total bed coverage at 10 lbs per gallon.

In that there is 5280 feet in a mile and allowing a 3 foot loss of distance traveled for the 30 lbs:

3 / 5280 = .0005681 miles lost.

(Sorry about that .000579 I posted. I tried to just calculate it in my head)

[This message has been edited by Raoul (edited 06-12-2001).]

 

ROTFLMAO!!!!!


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bIGGINS
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

My New Ride->>
2001 F-150XLT 4X4 Sport SuperCab
Styleside, Short Bed, Black on Black, 4R70W, 5.4L, 3.55reg, 17in Rubber, OEM Snapless Tonneau Cover, Harley Bedliner
Add On's
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My Last Ride->>
1999 F-150XLT 4X4 Reg Cab
Styleside, Long Bed, Amazon Green, 4R70W, 4.2L V6, 3.55reg, 16in Bridgestone Duelers, OEM Snapless Tonneau Cover

 

<grin> You've been eating blue crabs caught near the NNSY again, haven't you Raoul? All those PCB's are beginning to soften some of your grey cells, buddy.

hoyoman: Go for it. Whatever miniscule mpg loss you have is offset by the tremendous gain you'll get in having a MUCH quieter ride. A spray-in tightens everything in your bed, and muffles the rumblies quite a bit!!

[This message has been edited by sundog7 (edited 06-14-2001).]

 

Raoul,
I am not saying that your calculations are not valid but here is another way to calculate the loss in MPG:

30 LBS of liner goo (assumed from your post)
Regular Cab with standard bed weighs 3935 LBS. (Kelley Blue Book)
A 2WD w/99W 4.6L Engine & Auto Trans.: City 16; Hwy 21 MPG (Kelley Blue Book)

3935 + 30 = 3965
If you take 3935/3965=0.992433795715
0.99243379571515x15 = 15.8789407314 MPG (City)
0.99243379571515x21 = 20.84110971 MPG (Hwy)

This is quite a difference from your value.

hoyoman,
One way to offset the loss in MPG would be to lose about 30 pounds or take off 30 pounds of unecessary weight from your truck (like maybe the flux capacitor).

 

OK BlueFlareside, I'll buy into that logic.

3935 / 16city = 245.96 lbs = 1 mpg loss city

3935 / 21Hgwy = 187.38 lbs = 1 mpg loss hqwy

So, if I load my truck with 1,874 lbs then my mpg would be:
11.0 hgwy (loss of 10)
8.4 city (loss of 7.6 [1874 / 246])

It's clear to me now that the only ones complaining about Ford's gas mileage are the Lard Butts.

 

Raoul,

I think we are missing some factors in the equation. The main one being drag coefficient. If your payload is aerodynamic then your MPG does not go down as much even though it may weigh a lot. Consider two payloads:
1. A 4'x4'x4' cube weighing 1800 lbs.
2. A 4' diameter sphere weighing 1800 lbs.

The sphere is more aerodynamic so your MPG would decrease at a lesser rate than with the cube.

But the spray-in bedliners are not as smooth as the factory bed with those aerodynamic grooves in the floor. The spray-ins are actually bumpy, so that may reduce the MPG even more. Geez, I may have to get my physics book out for this one!

I say if all else fails just drive the truck until the little light (I think it is called an idiot light) tells you that you need gas.

[This message has been edited by BlueFlareside (edited 06-20-2001).]

 

Gotcha!

Smooth Lard Butts = no complaints

Bumpy Lard Butts = cry like little babies

 

That cellulite will get you every time!!

[This message has been edited by BlueFlareside (edited 06-20-2001).]

 

Are you guys kidding?

Go back and read through this topic.

Now, tell me that this topic really exists.

Next question:

If I hit a bug with my windshield, should I stop to wipe it off so it does not hurt my drag coefficient and my mileage?

 

ltmox,

If you cannot tell if we are kidding or not maybe you should re-read our posts. If you have read any of Raoul's other posts you know he is always 100% serious.

Now, about your question. I have not quite worked out the mathematical equation yet for each type of bug and the effect on the drag coefficient but as soon as I do I will post it here.

hoyoman
One more thing. If you are that worried about weight what will you do when someone wants to ride in the truck with you? I can just see it now....
"Hey, hoyoman, can I have a ride?"
"Sure, but first, how much do you weigh?"
"About 180 lbs."
"And we are going about 100 miles so you are going to cost me 1 mpg. Give me $3.00."




[This message has been edited by BlueFlareside (edited 06-21-2001).]

 

Yes, definately... also, be sure you've filled in every stone chip perfectly on the hood to maintain that silky smooth surface while cutting through the wind.

Oh, and be sure to get the wing for the tailgate too... Those downforces are essential at 60 MPH!! It'll ensure your truck corners like it's on... ummm tires.

-Joe-


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98 Explorer (Lemon Law Case in Progress)

'00 F-150, X-cab, 4x4, Lariat, Off-road, Trailer Tow, Holandia Sunroof($1000), built 11/99 picked up 10/00!Clear Corners($36), Manik Stainless Steel 1-piece brush guard($700), Custom CB wiring, Uniden PC76-XLW CB radio($100) with K-40 Magna-Mount antenna (for now [$40]), 1 set of 165 watt KC Daylighters (for now... more on the way... $140) Fog Light Switch mod(free!!!), Custom switch mounting plate and overhead console, Bully Stainless Steel Trailer hitch drawbar w/ 2" stainless steel ball($80), Gray Tek Style Soft Tonneau Cover($250), Gray Line-X Bedliner ($450).
List of planned mods: Clear tails, torsion bar tweak, bug deflector, Chrome ORP rims.
93 Probe GT teal, OE rims painted to match, bone stock drivetrain, leaky exhaust.

 

Hey guys don't forget that rough surfaces create turbulence. If you increase the turbulence, you decrease the pressure drag.

A dimpled golf ball is the perfect example. The dimples create turbulence, reduce pressure drag, and allow the ball to fly farther.

So therefore I think hoyoman needs to ask for or make his own dimpled bedliner.

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My first Baby:
2000 SC XLT Bright Red, 4.2L
5speed
K&N air filter
3" intake mod
16" perma cool electric fan
Jacobs DIS
best 1/4 mile: 17.1 @ 81.53 MPH
total MPG average to date 19.22

My Second (but most important) Baby:
Hailey Jean, born April 9, 2000