better MPG sc300 or sc400?
 

I was looking at a sc300 to buy becasue i figure the MPG would be alot better then the V8 but after searching for a while i found out that the v8 model was not that much less then the v6! why is that? i mean 2 cylinders should makea difference?

Its take more throttle to get the SC3s up to cruising speed, thus more gas used in accelerating. But when on the highway, the I6's obviously are better for MPG, unless of course its a 5-speed (3k rpm at 70mph blows)

Gearing has an impact. To compensate for less torque Toyota fitted steeper gears.

I get 15mpg in my SC300 5spd, in the city, 19mpg is the best i've gotten on the highway. If you don't want the 5spd, get the 400, faster and better milage!

400 wins in all categories. Less stress = less combustion.

wow, in my experience (i have a sc3 5spd and a sc4) the sc3 get much better mileage, i get 300-350miles to a tank with my sc3 highway and city mixed, and with my sc4 i was getting at best 300 to a tank of 90% highway driving.

sc300 has 2jz-ge ge = performance head
sc400 has 1uz-fe fe = economy head

It's an Inline-6, not a V6 - that bugs me.

Do you have anything to back that up?

Both my 1992 and my 1993 SC300's with auto trannys that cruise at 3000rpm @ 70mph both get 23 average miles per gallon. I am not a feather foot either. Want to know a trick how to instantly get 3-5mpg better? Take off the factory mufflers and just leave it resonators. My bone stock 1993 beater went from 18 to 23mpg with nothing else done except unbolting the mufflers on 210k miles on the motor and factory rims with some cheap tires.

He's right about that. The GE heads are performance heads, and FE heads are economy. Look at the different engines Toyota uses and you will see a correlation with most models.

Scott

though, i'll take my inline 6 when i have to work on it any day of the week.

The SC300 gets slightly better mileage the 5spd even better. SC4's usually come at a $1k premium from last time I looked. Use that money you save get a SAFC, Exhaust and K&N for of faster and better mileage car than the SC4 at the same price.

How does it sound? Is it really loud?
I'm curious about this mod since I thought it was the stock resonators that were the most restrictive, not the mufflers.

BEFORE "-":
the letters indicate the engine family, for example in 18R-G
the engine family is R, in 2JZ-GTE the family is JZ.
The number(s) at the beginning is the number of the are for a certain
bottom end version (block, bore, stroke). The larger the number,
the newer the bottom end version. It may seem like the larger the
number, the larger the displacement but this is not always true.

AFTER "-":
G = twin cam (wide angle, 45 degrees or more between the intake and exhaust valves)
F = "economical" twin cam (narrow angle, around 22 degrees)
T = turbocharged
Z = supercharged
E = fuel injection
i = single point fuel injection
L = transverse mounted engine (seems to be an obsolete code)
B = twin carbs (only used on non-twin cam engines, obsolete code)
R = air injection
S = swirl intake ports (only a few made in mid '80s)
S = direct injection & swirl pot pistons (starting from '97/98)
U = emission package (Japan)
C = emission package (California)
LPG = LPG fuel