Mpg better above 85mph!
Thread Starter
Melting Slicks
Joined: Jun 2010
Posts: 2,169
Likes: 1
From: Buford Georgia
Mpg better above 85mph!
So i know i have read countless upon countless threads in regards to going above 70 mpg BUT
i was driving down the Highway today... it was oddly wide open which is never the case...
i had the cruise control on at 70 in 6th gear..
flat surface i was getting 31ish mpg, and going up a hill (in 6th gear it would drop down to 20-24 depending on how big the hill was..
since it was so open and i have enver tried the above 70 is horrible gas mileage i thought id get it a shot..
so now with cruise control on at 85 mpg in 6th gear...
flat surface 35-36mpg, and up at hill 28-29 mpg..
So i guess im just trying to figure out why ive seen so many "above 70mpg kills your gas mileage?"
Thank you for taking the time!
Matt
i was driving down the Highway today... it was oddly wide open which is never the case...
i had the cruise control on at 70 in 6th gear..
flat surface i was getting 31ish mpg, and going up a hill (in 6th gear it would drop down to 20-24 depending on how big the hill was..
since it was so open and i have enver tried the above 70 is horrible gas mileage i thought id get it a shot..
so now with cruise control on at 85 mpg in 6th gear...
flat surface 35-36mpg, and up at hill 28-29 mpg..
So i guess im just trying to figure out why ive seen so many "above 70mpg kills your gas mileage?"
Thank you for taking the time!
Matt
Team Owner
Joined: Dec 1999
Posts: 174,312
Likes: 1,217
From: Here
Pilot of Beer Force 1
Tampa Regional Coordinator
CI 4-5-6-7-8 Veteran
Organizer St. Jude Fundraiser
I believe in the Beer Fairy
I haven't seemn the bad MPG over 70 threads..I have known for years I get better MPG over 70 in 6th gear...even with the cam and SC I get at least 31 as long as I stay out of the boost 
Drifting
Joined: Feb 2007
Posts: 1,793
Likes: 7
From: Santa Maria Ca.
So when the officer that just pulled you over asks you why you were speeding,just tell him "I was trying to save gas-I actually don't like to drive fast,especially in THIS thing".
That way,he'll realize you were just "going the extra MPH" for the environment,and probably thank you instead of issuing you a citation....
That way,he'll realize you were just "going the extra MPH" for the environment,and probably thank you instead of issuing you a citation....
Thread Starter
Melting Slicks
Joined: Jun 2010
Posts: 2,169
Likes: 1
From: Buford Georgia
the highway i live near is 75mph, traffic alwasy moves fast 80-85. cops wont pull you over on this highway as long as traffic is flowing
please this isnt a debate about speeding on getting pulled over, just looking for answers to the question PLEASE :-)
Thank you for your input!
Matt
please this isnt a debate about speeding on getting pulled over, just looking for answers to the question PLEASE :-)
Thank you for your input!
Matt
Race Director
Joined: Jul 2007
Posts: 18,681
Likes: 47
From: Reno is so close to Hell you can see Sparks , State Of Confusion
St. Jude Donor '12-'13-'14
Well first off it sounds like you are using the instant miles per gal on the DIC, That isn't very reliable at all, I can make mine say 99 mpg if I wish. The only true way is the old fastion way, Fill up write your miles down and next fill up figure out miles driven and gals used.
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
Thread Starter
Melting Slicks
Joined: Jun 2010
Posts: 2,169
Likes: 1
From: Buford Georgia
yes i have been using the dic, i took a trip to Oklahoma from georgia last summer, and i used that method, when it was all said and done the DIC was about 0.9 mpg different than your method. i used both to compare.
also i took in to consideration that when i stoped for gas my mpg went down being in lower gears.
so i just figured that the DIC worked pretty decent
havent done any research on the DIC to be honest about its reliability. but thank you for bringing it up. i will research that now!
Again thank you for all your input!
matt
also i took in to consideration that when i stoped for gas my mpg went down being in lower gears.
so i just figured that the DIC worked pretty decent
havent done any research on the DIC to be honest about its reliability. but thank you for bringing it up. i will research that now!
Again thank you for all your input!
matt
Pro
Joined: Mar 2009
Posts: 605
Likes: 11
From: Killarny MB
I found my car to be nearly identical whether driving at 60mph or 80mph. When crunching the numbers, I think the difference was only 1mpg. That was done driving to another city 450 miles away and then back home in one day.
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
I've noticed that I too get slightly better gas mileage when testing my mpg above the legal speed limit.
Seriously though, the car does seem to do better when it is going 75-80 mph.
Seriously though, the car does seem to do better when it is going 75-80 mph.
Thread Starter
Melting Slicks
Joined: Jun 2010
Posts: 2,169
Likes: 1
From: Buford Georgia
the biggest difference i noticed was on non flat surfaces, if im going up and down constantly. if im in 6th gear doing 65 im around.. o idk 1.5 rpms? which hurts my gas mileage when going UP a hill..
when im closer to 2.0 rpms around 80-82 mpg i believe. i get MUCH better mpg going up the hill. or atleast the instant DIC says
when im closer to 2.0 rpms around 80-82 mpg i believe. i get MUCH better mpg going up the hill. or atleast the instant DIC says
Safety Car
Joined: Sep 2005
Posts: 4,062
Likes: 103
From: Southeast, Tennessee
St. Jude Donor '09 thru '26
i consistantly get 30mpg (or just a bit more) when cruising fairly long distances with the cruise set at just under 80 (usually set at 78). in 6th gear, you're only turning about 1700 rpm, so that's pretty impressive in my opinion. compared to my 78 (lucky to get 15, lol) it's a real dream!!
Last edited by srs244; Mar 14, 2011 at 03:35 PM.
Le Mans Master
Joined: May 2006
Posts: 7,865
Likes: 248
From: Hillsboro OR
I have an 03 Coupe w/3:42's.
I was on a road...a long road....yea, a race track, that's it! I couldn't see anyone on this long straight track for ~3 - 4 mi. I turned on the "Instantaneous gas mileage" display on the DIC. I held the car at 90 mph for >3 miles and the DIC held steady at 27 mpg.
I was on a road...a long road....yea, a race track, that's it! I couldn't see anyone on this long straight track for ~3 - 4 mi. I turned on the "Instantaneous gas mileage" display on the DIC. I held the car at 90 mph for >3 miles and the DIC held steady at 27 mpg.
