15mpg... normal?

Motorhead350

Motorhead350

New member
Ever since I have bolted the blower on and off and on again my gas mileage has been down to 15mpg or so. I can't make it to 300 miles on a tank anymore, but close to around 250.

My car has also been throwing rich codes for a while that no one can ever seem to resolve no matter what advice I take. It seems like it's running fine. Move when I want it to, always starts, doesn't stall... stil operates and functions just as good as it was stock, but get's 15 mpg at best.

Is this gas mileage normal for a car with around 550HP to the crank with 4:10 gears? I think I was at 20 MPG with this setup before, but not sure.

I really wish this thing would just be fixed already.

Again 15mpg normal?
 
I don't know if it's normal, but it's definitely better than what I'm getting. I think I'm averaging ~10mpg in the city. I don't even get 300Kms (180mi.) to a tank. And that's driving quite conservatively. I'm hoping that getting the car dyno tuned will help some.
 
Dom, knowing how you drive, I'm not surprised you get poor economy.

Having just insulted you now, no...15 MPG does not sound "normal". On the way back from Cleveland after having The Blackbird dyno-tuned at Lidio's, we averaged just over 20 MPG on the highway with 4.10s at 75 MPH, 2 of us, and luggage for a week. I don't keep track of mileage around town, but 7 sounds VERY low.

As they say, YMMV...your Procharger setup is obviously different than my Trilogy, and you're tuned for more HP, but that still sounds low...
 
I average about 175 miles per tank.
If you own a supercharged car, drive it like it has a supercharger.....or else what the hell is the point?
 
Zack said:
I average about 175 miles per tank.
If you own a supercharged car, drive it like it has a supercharger.....or else what the hell is the point?
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amen, i love hearing that ***** whine. plus i dont drive it every day so when i do i gotta get my fix
 
ImpalaSlayer said:
amen, i love hearing that ***** whine. plus i dont drive it every day so when i do i gotta get my fix
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x2. I don't get to drive the car that much right now (recovering from some health issues). But hearing the "howl" (I call it a howl), is almost therapeutic for me. Maybe I'm getting into the pedal more than I thought, lol!
 
My Trilogy MPG

I regularly get 13-14mpg on my daily commute of 35-40mph suburban streets. I normally run it about halfway between "babying" and "abusing".
 
With 4.10's, 3500 Tc, CAI, and tune I barely got 18 on my last tank. Seems to be where its going to stay. Thats combined city/ highway but a tad more highway. I want a blower so at least I have a good excuse!
 
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