I've got all the stage 3 bolt ons and an intake. Running a 91 OTS tune (fill with 93). I believe I've averaged 42 miles per gallon according to the cars trip odometer on the highway.but I drive like an ass usually so it's around 26-27.
Leave it alone! ("performance wise") if you want to keep that 32+ MPG DON'T touch it. NOTHING you do will help... bolt ons and a tune will get you less MPG NOT more.
You could run meth injection, but then you have to fill a tank with an added cost but you will for sure get better MPG. return on investment will be bad LOL. if you plan to keep the car for 10+ years then it will pay for itself.
light 18" wheels and light weight tires will be the only help you can get
if you really want 17" then go for it but you just keep in mind that the package will likely be heavier. most 17" wheels are less than a lb lighter than the 18" but the tires are more than a couple lbs.
return on investment will be bad for anything you do. if you want rims then get them, if you want rims to get better MPG... well that is silly because you are going to spend $1000 on rims and gain .5 mpg better at most and it will take you years to see the return at the pump , $1000 is a LOT OF GAS
You bought the wrong car to want good MPG
If you're already getting 32+ mpg on the highway, you shouldn't expect much more. That's a hell of a lot better than 98% of the people on here, no matter how we drive. But more power to you (I guess not literally) if you can find a few ways to increase it.
If you need new tires and are willing to sacrifice some grip, look at low rolling resistance tires/eco friendly models. You can also get away with running a 225.40x18 (oem winter RS size.) Also, if you can improve your car's aero, it would help cut through the air (although being a mile high, i would execpt slightly less resistance already,) again check out the hypermilling forums for what they are doing.
Totally agree to what you are saying, but....
hypermilling these cars sounds like death to the ecoboost... the motor shouldn't be lugged and if you blow up a motor it will cost way more money then any money you saved at the pump, to save a penny you spent a dollar to replace a motor.
again High MPG is not what this car was built for... just my thoughts
Sounds like you spent a lot of money on a "sports car" to make it into a Prius, and drive it like one.
If I can figure out a way to up the efficiency of the engine, since after all it's really nothing more than an air pump, then mpg will subsequently increase. Typically, if you can figure out a way to more easily get air and in and out of the engine, it'll make more power, too. If I can figure out a way to decrease the spinning mass at the corners, that will help as well. How much stuff like airflow mods will change the mileage I've yet to quantify, but the car should react positively to anything that frees up air flow in and out of the engine. Might be a little or might be a lot.. just don't know yet.
Last edited by rob99rt; 07-08-2019 at 01:41 PM.
[email protected] mph at National Trails, and that was with wheelhop through 3rd gear. I'm sure a better driver could have knocked a few tenths off of that and picked up a couple mph, too. 0-60, though, was not that car's strong suit due to traction limitations, even with the lsd I'd put in it. The ST is much easier to get to 60 quickly.
ETA: so I had to take a drive about 70 miles North which was a 400 foot elevation change, and since we were hauling a dog I had to turn on the AC (which I never use). The mileage for the tank was way down compared to normal... 29.6. Still not awful, but the speed (cruise at 77-78) and AC definitely killed it. Looks like driving the 45-50 mph route to work is the way to save on fuel right now.