Supercharged Gas Miles
Pro
Joined: Feb 2005
Posts: 652
Likes: 16
From: Upton MA
I did a milage check to see how close my 72lb/hr @ 3bar injectors were to the advertized value. I drove @ highway speeds 60-80 very light acceleration for a 150 mile trip. The DIC indicated 21.7 mpg. The calculated miles per gallon , based on fuel to refill was 21.5 mpg. This is on an LS3 416" 800 rwhp manual with 3.42:1. Given that the DIC milage is calculated using the injector size for milage, I am very pleased that all the numbers agreed
Last edited by glennd; Sep 4, 2008 at 02:46 PM.
Racer
Joined: Dec 2006
Posts: 322
Likes: 0
From: Alexandria Louisiana
St. Jude Donor '08
Mpg
3.73's & a M6 behind a F1-R'ed 383 ( 752 rwhp @ 14# ) yields me 22-23 mpg highway. 
Not really concerned with city mpg because I shoot for SMILES per gallon there!!! 
Gene
Not really concerned with city mpg because I shoot for SMILES per gallon there!!! Gene
Last edited by Mean Gene55; Sep 4, 2008 at 11:24 AM. Reason: add comment
Pro
Joined: Feb 2005
Posts: 652
Likes: 16
From: Upton MA
The DIC uses the values in the injector size table, if the new injectors are loaded into the table are correct, then the calculations for fuel milage will be correct. I am using 72 lb/hr corrected to 4 bar pressure, and my indicated DIC milage equals the measured mpg. If you are reading substantially different from indicated on the DIC the chances are you do not have the correct values in the table.
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Premium Supporting Vendor
Joined: Oct 2004
Posts: 23,599
Likes: 1,226
From: Providing the most proven supercharger kits for your C5/6/7 609-752-0321
I guess I am getting screw I see 12MPG in the city and 16MPG hwy
540HP 520TRQ
ECS super charger, methanol install by them. I got the stock gears
DTE bracket, suspension, clutch, flywheel tune by ECS I don’t know what r other people talking about but I am the only one whit this numbers what’s wrong I am worried now.
540HP 520TRQ
ECS super charger, methanol install by them. I got the stock gears
DTE bracket, suspension, clutch, flywheel tune by ECS I don’t know what r other people talking about but I am the only one whit this numbers what’s wrong I am worried now.
Either you are constantly on it, or you have a failing O2 or something to that effect, you should be much higher than that.
Premium Supporting Vendor
Joined: Oct 2004
Posts: 23,599
Likes: 1,226
From: Providing the most proven supercharger kits for your C5/6/7 609-752-0321
Maybe it's just me, but I seam to notice about a 1/16 of a tank drop per all out pass at the track. To go threw a 1/4 tank in a race event is about average to me. (on the 9 second cars, especially big cube stuff)
Melting Slicks
Joined: Dec 2000
Posts: 2,118
Likes: 2
the most accurate way to calculate gas mileage for your FI car is to reset your trip odo at your next fill up. then when it comes time to fill up again take the miles you've driven and divide them by the gallons you just purchased.
using the DIC is not accurate because almost all FI cars have larger injectors or their tabels are scaled differently and that will screw with the stock injector calculations our cars use.
doing the math above I see anywhere between 12-14mpg with a mix of city and highway driving. On the highway best I've seen is a little over 300 miles out of 16 gallons of gas which is about 18mpg. I've never been able to just cruise threw a tank of gas w/o getting into boost at all so I'd guess I could maybe get 20-21mph on the highway if I drove like a *****.
edit: I've got 96# injectors, stock 3.42 rear, stock sized tires & twin fuel pumps...
good thing I didn't buy this puppy for fuel economy!
using the DIC is not accurate because almost all FI cars have larger injectors or their tabels are scaled differently and that will screw with the stock injector calculations our cars use.
doing the math above I see anywhere between 12-14mpg with a mix of city and highway driving. On the highway best I've seen is a little over 300 miles out of 16 gallons of gas which is about 18mpg. I've never been able to just cruise threw a tank of gas w/o getting into boost at all so I'd guess I could maybe get 20-21mph on the highway if I drove like a *****.
edit: I've got 96# injectors, stock 3.42 rear, stock sized tires & twin fuel pumps...
good thing I didn't buy this puppy for fuel economy!
It takes gas to make HP. I get about 8-10 mpg in town and about 22mpg if I just at cruise at 65-70. Anything other than cruising drops it under 18mpg. Anyone that says they can get 22mpg by jumping on it in town in the low gears is talking pure 
Last edited by HIGHRPM; Nov 18, 2009 at 12:10 PM.
Pro
Joined: Feb 2005
Posts: 652
Likes: 16
From: Upton MA
800 rwhp = about 1 3/4 gallon per min
a 10 sec run + burnout etc maybe 1/4 of a min. =s about .44 gal.
So using my numbers about .44 gallon per 1/4 mile run. All numbers are aproximate.
Safety Car
Joined: Mar 2004
Posts: 4,434
Likes: 18
From: Bartlett IL
St. Jude Donor '07-'08-'09-'10-'11
Before my blower I was averaging 18-19.
After the blower I'm averaging 14-15.
I do drive the car a little harder now.
Its about 25% hwy, 25% city and 50% spirited
After the blower I'm averaging 14-15.
I do drive the car a little harder now.
Its about 25% hwy, 25% city and 50% spirited
Burning Brakes
Joined: Jun 2006
Posts: 835
Likes: 0
From: fayetteville NC
Burning Brakes
Joined: Oct 2007
Posts: 976
Likes: 0
From: Brewster New York
Im getting about 15 around town and maybe 18 on the highway, sometimes down to 12.5 average around town. Compared to the Lingenfelter c5 I had previosly, that got an easy 30 on the highway. But the smiles are there!