Mpg Question
Thread Starter
Racer
Joined: Feb 2006
Posts: 426
Likes: 0
From: tx
Mpg Question
I have seen a lot of posts here about gas mileage, and mine does rather well. But, I have not gotten above the mid 20's doing the math myself per odometer and gallons used.
My question is about the 30 mpgs. "Is anyone doing the math or are these strictly from the DIC reading".
My DIC says I am getting better than I really am...Just curious I guess as I am satisfied with the mileage I get especially with a car that performs like this. '99 FRC
Steve
My question is about the 30 mpgs. "Is anyone doing the math or are these strictly from the DIC reading".
My DIC says I am getting better than I really am...Just curious I guess as I am satisfied with the mileage I get especially with a car that performs like this. '99 FRC
Steve
Race Director
Joined: Aug 2003
Posts: 13,421
Likes: 8
From: Lake Mary Florida
Oh goodness, yes I was getting about 425 miles per tank of gas on my trip to Bowling Green. Set the cruise between 70-80 in 6th. In town I usually get maybe 275 miles per tank of gas.
So doing the math, about 15 gallons per fill up on the trip for 425 miles is about 28.33 miles per gallon.
So doing the math, about 15 gallons per fill up on the trip for 425 miles is about 28.33 miles per gallon.
Last edited by Jet-Jock; Jun 14, 2007 at 11:17 PM.
Melting Slicks
Joined: May 2005
Posts: 2,866
Likes: 123
From: gresham oregon
I had a H/C change z06 ported heads, a big cam. LT headers and i am getting better gas milage with the engine modded due to the excellant breathing. I have 435rwhp m6. I am getting 33.5 mpg at 70mph with the air on! I could barely reach 30mpg. stock.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
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
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Race Director
Joined: Apr 1999
Posts: 15,143
Likes: 477
From: NM
I would think that the DIC would be more accurate then any manual system as it would be almost impossable to get the tank full to the same level each and every time.
Heel & Toe
Joined: Mar 2005
Posts: 20
Likes: 0
From: North Mankato MN
Last fall I did a run of 805 miles to Milwaukee and southern MN. The DIC said 33.5, I did the gallons and miles and came up with 32.5 MPG, of course, I did not go over 70 mph unless in MN then 75 and back to 58. Oh ya, did I mention a six speed with 65,000 miles on it?
Jerry
Got 73 for sale, love it but have no garage room in winter.
Jerry
Got 73 for sale, love it but have no garage room in winter.
Burning Brakes
Joined: Apr 2003
Posts: 812
Likes: 8
From: Pleasanton CA
I have a buddy who ran from Oregon to San Francisco last month with an '04 Z06. His computer read 32.9 m/g (yep, nearly 33 mpg) when he arrived home.
I also have a Pontiac GTP and the computer will tell me I used 13.4 gallons and the tank will take 14.3 to fill it. It can be as much as a gallon off, so when it's calculating m/g, it's using less gas than what was actually needed giving a higher m/g reading!
Ya gott-a watch those computers!
Hmmmm....Maybe I need to manually calculate on the Corvette.....
I also have a Pontiac GTP and the computer will tell me I used 13.4 gallons and the tank will take 14.3 to fill it. It can be as much as a gallon off, so when it's calculating m/g, it's using less gas than what was actually needed giving a higher m/g reading!
Ya gott-a watch those computers!
Hmmmm....Maybe I need to manually calculate on the Corvette.....
Administrator
Joined: Mar 2001
Posts: 368,297
Likes: 24,776
From: In a parallel universe. Currently own 2014 Stingray Coupe.
C7 of the Year - Modified Finalist 2021
MO Events Coordinator
St. Jude Co-Organizer
St. Jude Donor '03 thru '25
NCM Sinkhole Donor
CI 5, 8 & 11 Veteran
Yes, I have gotten better than 30 mpg when I have calculated it by hand. The DIC may be a little high, but not by much in my experience.
Racer
Joined: Dec 2006
Posts: 302
Likes: 0
From: Birmingham AL
Safety Car
Joined: Jan 2001
Posts: 4,387
Likes: 691
From: Boise ID
Yes, the DIC is pretty accurate. Every time I have calculated it, I found the DIC to be 1 – 1.5.mpg optimistic (both during city/play driving or long cruses). On long 75-85 mph cruses the DIC shows 33mpg.
Race Director
Joined: May 2001
Posts: 15,324
Likes: 2,077
From: Guelph, Ontario
I have found the DIC to be very accurate. If you figure out your gas mileage over more than one tankful (such as figuring it out over a month or two's worth of driving) you'll find that the DIC is almost right on the money (on mine it is within 0.2 MPG)
I get 18-19 MPG in mixed driving (tons of rush hour traffic) and 28-30 on long highway trips.
I get 18-19 MPG in mixed driving (tons of rush hour traffic) and 28-30 on long highway trips.
Race Director
Joined: Oct 2004
Posts: 18,401
Likes: 3
From: Retired but working
Cruise-In VI Veteran
Averaged 32.2 coming back from BG CI. The DIC said 32.3, but the calculator was 32.2. 70 + air on.
Going down was less 30.4 Targa off and 70-80. Seems I get better milage with the top on windows up and air on. Go figure.
Going down was less 30.4 Targa off and 70-80. Seems I get better milage with the top on windows up and air on. Go figure.
Safety Car
Joined: Feb 2004
Posts: 4,208
Likes: 2
From: Rochester MN
CI 5-6-7-8 Veteran
St. Jude Donor '04-'05-'06-'07
NCM Ambassador
.
Melting Slicks
Joined: Oct 2006
Posts: 3,447
Likes: 6
From: Los Angeles
I found the most accurate system is to:
1) Reset Trip meter during last full fillup
2) At next fillup, divide the number of miles on the trip meter since last fillup by the number of gallons needed to fill tank.
I average 22 mpg in the city/short distance highway. Long distance highway is 28-29 mpg with spirited passing/highway onramps. I can crack 30 mpg with conservative driving on the highway.
The results are pretty consistent considerring my driving style doesn't vary too much. I think that's pretty accurate IMO.
Last edited by DefenderC5; Jun 15, 2007 at 05:53 PM. Reason: speeling