If you are looking to tow a heavy RV and that is the sole reason to switch, you are better off putting that money into a few year old diesel pick up truck. No one has attempted the diesel swap. Many people have done the Supercharger. It would help with towing.
Your statement "How many extra milles can I do with a supercharger ?" is ambiguous. Are you referring to MPH, MPG, miles per tank??? The supercharger actually gives your worse fuel economy than stock.
To buy a supercharger, is it worth the gaz economie ?
does it make at least 50 mpg extra ?
I see you are from Montreal, so i assume french is your native language.
I think you are confusing MPG with horsepower maybe?
The TRD supercharger adds about 60HP i think. I am not sure on the MPG drop, but i know that it does reduce your fuel economy.
Ah, okay. You do not need more power to tow (only people that think this are the macho guys trying to compensate because it takes longer than 10 seconds to get to 60 hauling a huge trailer) The FJ has enough power. Your problems towing heavy objects is the size of the FJ. A small vehicle towing a large trailer will get pushed around by the trailer. It has a max towing capacity of 5000. So include yourself, whoever is with you, gear, subtract that weight from the 5000 and that leaves what you can tow. 4600 should be okay though.
Make sure the tongue weight is no more than 500 lbs, and don't even think about towing this trailer unless it has trailer brakes.
supercharger WILL help you with the MPG. It'll be a big help in lugging that big RV. Your other option is too regear your tranny to a more of an aggressive ratio, which will give you more power and slightly better MPG.
I know its hard to do but if anyone that has a supercharger and would care to try and drive it like they own it instead of that they stole it I wonder if the MPG would actually not improve.
I had an Avalanche with a Vortech SC and I drove it fairly hard and got about the same as stock for MPG.
30 yrs ago) 350 Chevy V8 Conv., 4Spd GMC Truck Tranny, (IT BURNTUP)
Linear Mode
