Low MPG why?
Thread Starter
Navigator
Joined: May 2015
Posts: 9
Likes: 0
Low MPG why?
My vette has been giving me 15 mpg throughout the whole tank. The best I've gotten so far is 17mpg and that was a 300 mile trip. I've attached live data at idle from my obd2 scanner. Note the trims are in the negatives? Is this normal?
Thanks,
Aj
Thanks,
Aj
Melting Slicks
Joined: Jul 2005
Posts: 2,990
Likes: 346
From: Mt. Pleasant S.C.
We no know thing about your car. None of us are mind readers.
z06? year? mileage? auto? manual? mods? has it been tuned? Is this car new to you? if not, is this low mileage new? what did it used to get?
z06? year? mileage? auto? manual? mods? has it been tuned? Is this car new to you? if not, is this low mileage new? what did it used to get?
Thread Starter
Navigator
Joined: May 2015
Posts: 9
Likes: 0
2003 c5 z06, 54k miles, no mods, just bought the car, and its manual. I don't really have a heavy foot but I occasionally step on it.
I just went to Abel Chev to get the check valves fixed and some vacuum leaks. Other than that I believe its running rich because the exhaust smells but that just could be me. Sorry for the vague info in my previous post
Melting Slicks
Joined: Jul 2005
Posts: 2,990
Likes: 346
From: Mt. Pleasant S.C.
I know that you said no mods, but if it smells that bad I have to ask the obvious. Does it still have cats? 17 around town is normal. 17 on a 300 mile highway trip is not normal. And neither is a rich smell.
If you have an OBD2 reader are you O2 sensors reading right (note: this is pretty much a wild guess still)
If you have an OBD2 reader are you O2 sensors reading right (note: this is pretty much a wild guess still)
Team Owner
Joined: Dec 1999
Posts: 34,873
Likes: 487
From: Lacey WA RVN 68-69
NCM Sinkhole Donor
So the 17MPG for that 300 mile trip was from the DIC? Or did you calculate it the old-fashioned way? Were you using 6th gear?
My '02 C5 6-speed coupe will get 28-30 MPG on long trips and that's a manual calculation, not from the DIC. The car has a Vortec supercharger and a SuperChips tune. Around town it will get 17 MPG. On the track, maybe 8 MPG on a good day....
Wonder if you have one or more injectors dumping fuel??
My '02 C5 6-speed coupe will get 28-30 MPG on long trips and that's a manual calculation, not from the DIC. The car has a Vortec supercharger and a SuperChips tune. Around town it will get 17 MPG. On the track, maybe 8 MPG on a good day....
Wonder if you have one or more injectors dumping fuel??
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
Navigator
Joined: May 2015
Posts: 9
Likes: 0
So the 17MPG for that 300 mile trip was from the DIC? Or did you calculate it the old-fashioned way? Were you using 6th gear?
My '02 C5 6-speed coupe will get 28-30 MPG on long trips and that's a manual calculation, not from the DIC. The car has a Vortec supercharger and a SuperChips tune. Around town it will get 17 MPG. On the track, maybe 8 MPG on a good day....
Wonder if you have one or more injectors dumping fuel??
My '02 C5 6-speed coupe will get 28-30 MPG on long trips and that's a manual calculation, not from the DIC. The car has a Vortec supercharger and a SuperChips tune. Around town it will get 17 MPG. On the track, maybe 8 MPG on a good day....
Wonder if you have one or more injectors dumping fuel??
I calculated it the old fashion way. I used 6th gear and was cruising at 70mph the whole way there. I'm not really sure wants going on. I posted some live data on the first post.