ok i will expand on orig post.
i have owned a 2003 tacoma I-4 manual 4x4 with fwc eagle yes overloaded never got better than 17mpg average
for the time i owned 2plus years.
2008 tacoma4x4 v/6 manual used with fwc eagle and at times a six pac hard side camper also over loaded again right at 17 mpg average.
so when i went to the 2015 i was planning on same milage so i was also doubting mpg.
talked to a couple of different toyo mech's seems like the new I-4 is little different for early ones
they require 0-20 oil not 5-20 also a few more hp than older,seems to be the reason for better mpg.
now on to my milage claims i said cruise set to 64 on high way yes but we travel on few high speed roads
1 La quinta to Vegas freeway (Prim Nev. to vegas cruise control) 1st fill up 17.6 mpg.
2 vegas to ely Nev. fill up 18.40 mpg.no cruise
3 Ely to Twin falls Id, fill up 20.73 mpg no cruise but a Tail wind Ha Ha!
4 Twin falls to Challis Id fill up 20.43 mpg no cruise
5 Challis to Salmon Id. fill up 18.19 mpg no cruise
6 Salmon Id. to Missoula Mt. fill up 21.00 mpg no cruise.
7 Missoula Mt. to Grangeville Id. fill up 20.23 mpg no cruise.
8 Grangeville to Boise Id.fill up 19.30 mpg. no cruise.
9 Boise Id to Winnemucca Nev. fill up 18.00 mpg no cruise
10 Winnemucca to Carson city Nev fill up (cruise control 69) to Reno because speed limit 75 did not want to be to slow! 17.50 mpg.
11Carson city to Independence Ca fill up 20.78 mpg
12 Independence to La quinta (cruise control tell Cajon pass) Tail wind all the way! 19.34 mpg.
them are the figures i thank milage increases once you get away from calif gas blend.also we did not hit head winds
on any stretch of trip.
we are never in a hurry and i really like to work at getting the most mpg that i can so i do a lot of hyper milage stuff.
EPA estimate rating's are just that estimates.
i also have a daily driver (toyota echo) rated at 38 highway but always get 42-44 mpg and a 2013 ford transit EPA highway
27 mpg and 28 mpg is what i get with it.
as far as being overloaded i still feel the rating are low to cover the manufactures.
example my transit says no trailer towing,but the same transit in Europe is rated for towing. go figure.
i"m to lazy to look it up but would not be surprised if GVW rating for same tacoma would be different in other country's.
i do not recall any rig that i have owned that was not over the limit including the 2012 Provan 4x4 bengal expo vech
that we had custom built. i know all my vw vans were always over loaded,my custom 1972 step van motor home.
i'm only expanding on subject for general information not trying to change peoples thought's on legal/safe/smart/.
i do know that i am well aware of what i'm driving and always keep this in mind as we enjoy the back country.