yea, as someone earlier stated, i had a chevy2500hd, 6.0, was an 03, bought it with about 13k on it, i got 10 in winter and 13 in summer MAX, thats it, had 4.10's. at first had the 245 tires on it, they were tiny and still got crap for mpg, i switched to 285 ( 33's) on the factory wheels, and mpg honestly didnt change, kinda just balanced out. now i did drive however i felt like, just like i drive tunder, in chev best ever was 17highway, quad in back, followed a dodge ram for about 100 miles, stuck to it like flies on poo, they got off and were staring at me, i figured they were haulin, i was gonna follow..., but i may have goofed on math when i filled, never figured out how that happened.
now, tunder, i had been getting about 12.5-12.7 ish, i haven't calculated since last fall, haven't really driven it at all in winter, and so far its still winter out, dont drive enough to justify filling it, or calculating when i fuel it up.... gimme a few weeks and ill figure out what im gettin, but it will be only gettin 1/2 use, my car simply gets better mpg.
AFE made the trd cai for fj, and im pretty sure they make the tundra's too, but it is a lil different design and has the a/f cloggometer which is useless to me.
and as true as a more free flowing exhaust does help, it can also hurt tq down low, and also too large of pipe diameter can affect scavenging effect and hurt all around. heat wrap does help when you are running huge diameter pipes, the hotter gasses escape faster instead of cooling down, thus turning more dense and slowing... really.
tonneau, im iffy on this, i have one now, and mpg hasn't changed, then again, i also haven't really driven enough to say.
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I put the Laughter in Slaughter, and the Fun in funeral.
KTM 450xc QUAD, Baldwin head, Ti valves, 8/06 cam, motoworks, goldspeed tires...
Had/gone 2010 CM RW that was sweet,
NOW: 2017 Platinum. Tinted, trd duals, Exo Grapplers.
I like weapons.
I dont capitalize, use spell check, or punctuate properly...
and you can call me Power.