Actual MPG not close to Computer MPG
Burning Brakes
Joined: Jul 2004
Posts: 1,194
Likes: 111
From: If your not the lead dog the view never changes Boise, Id
Burning Brakes
Joined: Apr 2006
Posts: 926
Likes: 12
From: Lutz FL
Don't just reset the trip meter. Reset the average MPG as well. Just navigate to that page in the DIC and hold the reset button. There may have been a whole lotta miles driven on the street that are affecting the average MPG. Resetting it will clear the history out and start over.
Intermediate
Joined: Oct 2007
Posts: 28
Likes: 0
From: Bedford VA
No Charlie, nothing wrong with my DIC at all...just ask my wife!!!! 
But seriously, I have noticed the C5 98 computer to be off about 1mpg in normal driving, and it is optimistic. Just for the record
Hotshoetom in VA
But seriously, I have noticed the C5 98 computer to be off about 1mpg in normal driving, and it is optimistic. Just for the record
Hotshoetom in VA
Racer
Joined: Jun 2006
Posts: 256
Likes: 0
From: Fresno Ca.
i've kind of wondered this as well. the DIC will show an average for example; 20 mpg. after fueling up, the DIC will show an average, example, 28 mpg. let the car set a day or two and the mpg average drops, example; 19 mpg. it always shows more mpg right after a fill up and will drop after car sets for a while. all the numbers used here are an example only and not the actual mpg.
is this normal?
is this normal?
Le Mans Master
Joined: Mar 2002
Posts: 5,955
Likes: 161
From: PNW
i've kind of wondered this as well. the DIC will show an average for example; 20 mpg. after fueling up, the DIC will show an average, example, 28 mpg. let the car set a day or two and the mpg average drops, example; 19 mpg. it always shows more mpg right after a fill up and will drop after car sets for a while. all the numbers used here are an example only and not the actual mpg.
is this normal?
is this normal?
I've tracked my MPG and compared it to the DIC MPG ever since I got my Zee in 2002. The DIC normally reads only 2~4% higher than a calculated MPG based on miles and pump gallons -- not too shabby IMO. I've watched the DIC MPG right after a fill-up and reset, and it seems to settle into what the normal MPG avg would be after about 5~8 miles of driving.
Racer
Joined: Jun 2006
Posts: 256
Likes: 0
From: Fresno Ca.
yes, this is after resetting the DIC after each fill up. everytime i fill up, reset the DIC, i get higher average mpg on the DIC. it will plain out to +- 26mpg. once i let the car set for a day or two (or even longer) the average mpg is lower 20 mpg until my next fill up. according to the DIC i get better gas mileage immediatley after a fill up. its just one of those things that make me go... Hmmmmmmmm????
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Le Mans Master
Joined: Sep 2004
Posts: 5,707
Likes: 4
From: Los Angeles
yes, this is after resetting the DIC after each fill up. everytime i fill up, reset the DIC, i get higher average mpg on the DIC. it will plain out to +- 26mpg. once i let the car set for a day or two (or even longer) the average mpg is lower 20 mpg until my next fill up. according to the DIC i get better gas mileage immediatley after a fill up. its just one of those things that make me go... Hmmmmmmmm????
