Gas mileage check
#1
Legacy TMS Member
Thread Starter
Gas mileage check
I recently did a lot of highway driving and my gas mileage was just a few
tenths under 23 mpg (07 GT, 3.55s, manual). I used the A/C the entire time.
Is this decent/normal gas mileage or could I take it easier on the gas? The car has less than 2000 miles on the odometer, and I'm using 7 qt of Pennzoil Platinum 5W-20 (just changed the oil).
The 2008 EPA rating system estimates the 07s at 15/23, so it seems like I'm just about on the dot. I normally get 19 mpg with 50/50 city/highway driving, which is about half-way between 15/23.
tenths under 23 mpg (07 GT, 3.55s, manual). I used the A/C the entire time.
Is this decent/normal gas mileage or could I take it easier on the gas? The car has less than 2000 miles on the odometer, and I'm using 7 qt of Pennzoil Platinum 5W-20 (just changed the oil).
The 2008 EPA rating system estimates the 07s at 15/23, so it seems like I'm just about on the dot. I normally get 19 mpg with 50/50 city/highway driving, which is about half-way between 15/23.
#3
Mach 1 Member
Join Date: October 15, 2004
Location: Wisconsin
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I have an 05 vert, gt with auto and 3.31. On a long trip to Colorado, I saw a best tank of 23.5 and a worst of 22. Around town and going to work I see 20-21, depending on how hard I get on it.
#5
Legacy TMS Member
Thread Starter
I was moving with the flow of traffic, so it was about 70-80 mph. My speedo reads 3 mph faster than the GPS...
Steve: Yes, I filled it to 7 qt. It takes about 6.5 qt to reach the mark, and I figure I might as well just dump the other 0.5 qt in there.
Juice: I have a hardtop coupe and I use 87 octane gas. It's totally bone stock in terms of mods. I never touched the PCM.
Steve: Yes, I filled it to 7 qt. It takes about 6.5 qt to reach the mark, and I figure I might as well just dump the other 0.5 qt in there.
Juice: I have a hardtop coupe and I use 87 octane gas. It's totally bone stock in terms of mods. I never touched the PCM.
#6
Tasca Super Boss 429 Member
I've never seen anything that says it is okay to OVERFILL.
Half a quart below YOUR mark would be 6 quarts.
"• If the oil level is between the lower and upper holes, the oil level
is acceptable. DO NOT ADD OIL.
• If the oil level is below the lower hole, add enough oil to raise the
level within the lower and upper holes."
#7
Just took a trip to Pa. from Ct. 440 miles. Trip computer said I got close to 29 mpg (07GT ,3.31, 5spd.). I haven't tried to compute it myself but if its reading properly, that's more than I ever expected. I tried to use CC at 65 mph most of the way and tried to lean it out when I could. AC on most of the way.
#8
I recently got around 13 mpg. However, that was doing 3 15 minute sessions at the road track with a race tune and high test fuel. With the 91 tune, I generally get around 18-20 in town driving if I keep my foot out of it.
#9
I recently did a lot of highway driving and my gas mileage was just a few
tenths under 23 mpg (07 GT, 3.55s, manual). I used the A/C the entire time.
Is this decent/normal gas mileage or could I take it easier on the gas? The car has less than 2000 miles on the odometer, and I'm using 7 qt of Pennzoil Platinum 5W-20 (just changed the oil).
The 2008 EPA rating system estimates the 07s at 15/23, so it seems like I'm just about on the dot. I normally get 19 mpg with 50/50 city/highway driving, which is about half-way between 15/23.
tenths under 23 mpg (07 GT, 3.55s, manual). I used the A/C the entire time.
Is this decent/normal gas mileage or could I take it easier on the gas? The car has less than 2000 miles on the odometer, and I'm using 7 qt of Pennzoil Platinum 5W-20 (just changed the oil).
The 2008 EPA rating system estimates the 07s at 15/23, so it seems like I'm just about on the dot. I normally get 19 mpg with 50/50 city/highway driving, which is about half-way between 15/23.
I also did a previous experiment on a shorter 90 mile trip. I reset the mpg before getting on the highway and did a fairly constant 70mph with the cruise control and a/c on and I got 25.1mpg
Last edited by Fords4Ever; 3/6/08 at 03:53 PM.
#10
Legacy TMS Member
Thread Starter
My GT doesn't have the IUP, so I calculate it the old fashioned way: Miles / Gallons of gas used to fill up the tank
I played with a trip computer in a rental 07 Taurus and I thought it was pretty neat. Had I played with a trip computer prior to ordering the GT, I would have gone with the IUP but I don't have any regrets.
Karman: Engine oil fill levels aren't an exact science. I figure the 0.5 qt would feel lonely on the shelf, so I dumped it in. If I notice a hit in gas mileage, I'll go back to 6 qt for the next change.
I played with a trip computer in a rental 07 Taurus and I thought it was pretty neat. Had I played with a trip computer prior to ordering the GT, I would have gone with the IUP but I don't have any regrets.
Karman: Engine oil fill levels aren't an exact science. I figure the 0.5 qt would feel lonely on the shelf, so I dumped it in. If I notice a hit in gas mileage, I'll go back to 6 qt for the next change.
#11
I'm approaching 5k miles and I think my mileage has improved slightly since break-in. I'm getting maybe a little above 25mpg at 75mph, CC on, air off, measured by the computer. And for the record I put in 6.5qts for an oil change + filter, that puts me a little below the upper hole on the dipstick. I don't think oil level would affect MPG unless it was drastically high or low.
#14
Tasca Super Boss 429 Member
#15
Legacy TMS Member
Thread Starter
I believe our engines have a windage tray (possibly even a scraper?) so the excess oil shouldn't have an effect on horsepower or gas mileage.
I also shift at about 1500-2000 RPM on the road and get 18.5-19.5 mpg in mixed driving. When I drive like this, a puny Toyota Echo can easily pass my car on the road.
I also shift at about 1500-2000 RPM on the road and get 18.5-19.5 mpg in mixed driving. When I drive like this, a puny Toyota Echo can easily pass my car on the road.
#16
#18
Legacy TMS Member
Thread Starter
I'm sorry to hear that. For what it is worth, I rather like the factory 3.55s on my 07 GT. I wish I had gone with the 3.31s for slightly better gas mileage as I don't really need the acceleration.