85 , 87 , 91 Octane ? -----E85 +/- ?

I have always driven a sports car mostly with superchargers so I have always used the highest octane I could find normally being 91 here in CO.
Now that I have the V6 in my 2008 TRD Sport do I still need to run 91 or would 87 work with out taking away any longevity from the engine? Any other huge negatives? Gas is high and getting higher so just looking at cutting back where I can, but it is not worth it if is going to cause even small problems. Also any thoughts on converting to E85?

 

87 is ok per manual, and you cannot run E85, also per manual

 

usually go with the 87

 

easy solution slap on a supercharger get the x1 and a high boost pulley and some ethonal injectors and run E85.


But otherwise 87 will be fine

 

on my ols 4.0l i always ran 91, i tried 87 and 89 and i noticed a diff in mpg and overall response from the truck and when i towed even more so.
E85 is a great thing i run it in 2 of my cars but theres a lot involved with ensuring having a full system that can support the extra fuel requirements needed for E85 plus the need for the tuning needed to take advantage of the ignition/fuel tables.
i bet $ a stock 4.0L tuned on E85 will put around 330-350hp

 

Supercharge, than the conversion to E85 would be worth it!

 

with ya on that......

 

ive felt and noticed the diff, remember this is a 10:1 comp motor and heres something too take it as you will
str8 from WIKI



The 1GR-FE is the 4.0 L (3956 cc) version, designed for longitudinal mounting in RWD and 4WD pickup applications. It has a 94 mm bore and a stroke of 95 mm. Output is 236 hp (176 kW) at 5200 rpm with 266 lb·ft (361 N·m) of torque at 4000 rpm on 87 octane, and 239 hp (178 kW) at 5200 rpm with 278 lb·ft (377 N·m) at 3700 rpm on 91 octane. This engine features Toyota's VVT-i, variable valve timing system on the intake cam and a compression ratio of 10.0:1. An updated version of this engine features Dual VVT-i, increasing output to 254 hp (189 kW) and 270 lb·ft (366 N·m) on 87 octane and 285 hp (213 kW) and 289 lb·ft (392 N·m) on 91 octane

 

Regular 85 is fine too in Colorado (anywhere there is higher altitude) but not E85 as others said. I run regular 85 in mine with no problem.

 

HP isnt what you feel but the TQ, but you do not see a graph you you could be seeing a lot of usable torque that you wont get with lower oct. fuel.

 

I was told by a friend that build race motors, that if it's high compression or boosted, then you go with a higher Octane.