Campinfan
Washtenaw County, Michigan
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Joined: 05/18/2005
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When I have my tonneau on I get about 1 more mpg (or a bit more if mostly hi-way). When I had an F 150 and had a cap on it, it was pretty much the same as without.
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2008 F 250 FX4 4WD, V10, 4.10 Tow Command
35' 2007 Crossroads Cruiser CT32SB
Wonderful Wife and 3 small kids
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RRUGG
Newaygo, MI,USA
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Joined: 08/08/2003
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I had a tonneau, now have a topper. Don't see a difference towing. Prefer the topper for taller covered space.
RRUGG
2008 Dodge 2500 QC 4x4 SB Cummins 6 speed auto 3.73
1997 Holiday Rambler 29FK travel trailer
2006 Summit 22RB travel trailer
2003 Dodge Grand Caravan Sport
Bob & Grace professional retirees
Good Sam life members
Camped in 49 states. Missing Hawaii.
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GlacierBayGuy
Holland MI
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Joined: 05/21/2007
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I have added caps to 2 trucks and did not notice any difference in fuel mileage. Maybe any improvement in aerodynamics is offset by additional weight.
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robbie69
wauconda, il usa
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Joined: 02/22/2004
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have the fiberglass top. haven't noticed any difference and it would have to be pretty drastic(bad) to get rid of it. for me, it's my lockable trunk. even with the crew cab and all seats in normal position there is hardly any storage space.
2004 silverado 2500HD crew cab 4x4 long bed 8.1L gas hog
2006 skyline nomad 3260 platium edition, prodigy, reese dual cam
1 very part time camping son and 3 full time camping, 4 legged fur balls
1 SU (spousal unit) who loves rv'in as much or more than me
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Apple
El Dorado, KS USA
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Joined: 10/05/2003
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I have an 07 Sierra Crew Cab with a matching fiberglass topper. Wouldn't have it any other way - lots of storage for bikes, etc. that can be locked and out of the weather. Haven't paid much attention to mileage without - I ordered the topper when I took delivery on the truck.
Steve
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samsontdog
Sac. Ca summer, Yuma Az winter
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Joined: 08/06/2002
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I would not be with out a topper ! Have to have one with all the "stuff" that I haul in the bed that I want to keep dry and locked up. Bikes, gen, wood, chairs etc .Found no difference in gas mileage with or without the topper on
samsontdog 
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Canuck Travellers
Lutes Mountain, N.B., Canada/Sebring, FL
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Joined: 10/13/2002
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We have a Retrax Tonneau, on long trip (2100 miles from Florida to eastern Canada) with our 2500HD Duramax get 20 Mpg (US Gallons), don't know for absolute sure if Tonneau helps but think it does.
BTW MPG computed using an Excel program over five years use.
Chevy 2500 Diesel/Allison,Retrax Tonneau,Weston Platinium Steps, Michelin 265 Skins,Prodigy Brake Controller, Garmin 60CSX, Garmin Nuvi 750. Former Titanium 32E37Ds, Funfinder 210WBS
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Rubiranch
Salt Lake City, UT
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Joined: 03/09/2004
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I don't think I ever checked my mileage one way or the other, it was always bad.
If I didn't need a shell I wouldn't get one and I never cared for tonneau covers.
It's definitely easier to drive with a tonneau cover vs a shell.
TV: Mint 1972 Ford F-250 XLT
TT: 1969 19' Excel; entertains 6, feeds 4, sleeps 2
You don't shoot to kill, you shoot to stay alive.
I don't carry because I have to, I carry because I get to.
I like new things-
- when they're 40 years old!
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grantster
Beautiful British Columbia, Canada
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Joined: 06/04/2004
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We love our Leer Cap on our F150. Way more storage for camping, no discernable difference in gas mileage...
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jdubh2
The Midwest
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Joined: 01/22/2008
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I lost 1mpg with the fiberglass tonneau. No difference towing. I want a cap though, just so I can put my bikes in the bed standing up.
2008 Toyota Tacoma 4x4 DC V6 4.0L Supercharged 307HP 310TQ
2007 Cruiser RV Fun Finder 250BHS, Equalizer, Prodigy 5500#'s 27ft
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