If I reset my truck back to stock, unplug the battery for 15 min, put it back together and back to level 2 on my evo, is there the chance I could get worse mpg then before. Or will it give me at least what I was getting. How do you know what your getting for mpg? My mpg guage flucuates up and down, how can i say 17 around town or 24 on hwy. Is there a option that will clearly tell on my CTS evo?

 

You don't need to pug the truck back to stock.
Just unhook the battery for 15 min.
That will erase the KAM.



Peace!

 

I disconnected the battery for 15, re-connected, started the truck. I shut the truck back off, plugged the edge evo back in. Started the truck and now I see on my rpm guage it runs faster. Before it was governed down to 500-600 rpm in park. Now it sits at idle closer to 900 rpm. Would that mean the person who owned the truck before me drove it gentle or more conservative? I liked the lower rpm idle do to less gas consumption. I havn't had a chance to drive it yet (At work). Would that also mean my rpm will be higher giving me less MPG. My evo does not have an average MPG setting, only instant. How can I figure out MPG. I think I might get less now due to disconnecting the battery.

 

1. Fill your tank.
2. Write down the odometer reading.
3. Drive the truck for 1/2 to 3/4 tank.
4. Fill the truck. Save the receipt.
5. Write down the odometer reading.
6. Subtract mileage in step 2 from mileage in step 5.
7. Divide result in step 6 by gallons in step 4.
7. Result is miles per gallon for that tank of fuel.

 

Thanks will do that.

 

a lot easier..
1. fill tank
2. reset trip odometer
3.drive as much as you want. i have found if you fill up after using 1/4 a tank, it seems to get better mileage than if you let it go down to 1/2. dont know why but my 04 heritage did it all the time.
4. fill up again, try to go to the same pump you did in step 1
5. before starting your truck, turn it to "ON" and look at your trip odometer, divide your miles by the number of gallons on the pump's readout. thats your MPGS for that tank.
-to get a more accurate reading, do this every time you fill up and save all the MPG results you get. after about 5 or 10 add all of them together and divide by how many times you filled up. this is your average MPG.

for example..one tank...
fill up and drive 200 miles, fill up again. it takes you 10 gallons to fill up. so 200/10=20mpg for that tank.

for example...average...
you fill up 7 times and you get 17,18,19,16,17.5,19.5 and 20.
add them all together...127 and divide by 7=18.142857 and round so you get 18.1mpg average.

 

This calculation will only be true IF you drive the exact same number of miles each time.

I have to keep track of mileage for work so I don't use the trip odometer. Plus then I have an accurate mileage record.

 

the average will be a lot closer if you do the same maileage every time but thats why you do it after 5 or 10 not just 2 or 3. heck do it after 20 or 30 if you want. its just a rough estimate of what your truck is doing. the part about using the trip odometer is right. its the same thing you put just without having to write down any odometer reading and subtracting the OTHER odometer reading later on.
after you fill up, just pull out your cell phone(in your truck) and type in number of miles on your trip odometer and divide it by the number it shows for the gallons you put in. thats the mpgs for the miles you drove. then reset the trip and do it over again next time.

 

i mean heck it will be so close it wont really matter. so you got 17.3mpgs by doing it your totally accurate way.. well my way off of your picture gets 17.2 if you keep track of you mpgs you calculated, it will get more and more accurate with the more fill-up calculations you add on.
lol sorry man, but i think your the only one who keeps a spreadsheet of their mileage in their truck. my mom had to keep track of her odometer with pencil and paper when her trip odometer stopped working a long time ago.
i mean really, the ONLY reason you are doing it that way is for records for work. if you didnt have to do it, you would be doing it the way i said probably. heck, half of everybody forgets to write down their withdrawal of $20 in their checkbook let alone remember to go on their computer and add to a spreadsheet. i gotta fill in 2 withdrawals that i forgot about until now.

 

No worries. The accuracy of the numerical average will depend on the range of the actual mileage per gallons and distance travelled at that MPG.

 

No he isn't. I fill up every time I buy gas and I have a spreadsheet from when I bought the truck, 5 years ago. I have notes indicating if it was a trip, all highway and where, etc. Just something I enjoy keeping along with a complete maintenance record.

By keeping the record, I discovered I get about 10% better mileage if I fill up when the tank is over half full. Found out the reason why is the EVAP system.

 

Come to think of it, I recall a recent post on another forum where an owner used his MPG log to force the dealer/Ford to investigate his loss of MPG (dropped from 16-17 to 12-13). Ford and/or dealer told him 12-13 was normal mileage for his truck. He showed the dealer the log and said if 12-13 is normal, what was 16-17? Abby-normal? (LOL)

Anyway, Ford/dealer investigated and I think the found a cracked exhaust manifold (not sure on this one). Fixed and MPG went back up to 16-17...

 

lol i was just messing. just saying that most people dont care enough to write it down like that. a lot just like to calculate what they got for that tank and if it goes from 20 one tank to 14 the next, they know somethings up. like my V6 went from 19.9 to about 15.5 in the winter, but i knew the winter mix and the added weight for traction and the tires losing some pressure in the single digit temps and also -single digits, that it would effect it. seems that the only vehicles that arent effected by the winter mix, at least from my experience, are carburated ones.
yeah bud, i was just bustin your *****

and bluejay, i am not surprised that you do this too lol.

on my end, i drive fast everywhere so i am not too worried about fuel economy. when the gas went up to above $4 a gallon i traded my lead foot for a carbon fiber one but still had to have my occasional fun. now that i think about it, im probably paying the same for gas now than when it was $4 because i use a lot more gas now lol
just bought a replacement K&N air filter for my intake yesterday too. my old one got a small hole and the mesh got dented and broken in one spot. so now i have a nice new one in there.

 

yeah i used to fill up after i dropped to 3/4 all the time, then when i started doing it less, i got less mpgs. noticed it in my last truck. i have posted that many times on this site, glad someone finally found out why. well when the weather gets warmer i guess ill start filling up more often again. heck i hit my low fuel light 2 weeks ago. first time in that truck and hopefully last. only hit the low fuel light on 2 vehicles now. once for both.

i think i heard about that, but really unless you keep all the receipts too, you could just make a 10 page spreadsheet in one day and say you started it a year ago or whatever. but i guess youd at least have to have some receipts that correspond to your spreadsheet to show you arent BS-ing
i mean really, if it works for you, great.

 

so i just figured out what may be contributing to my bad milage. i calculate it by and as well as reading it off the message center and my gryphon. but i finally got a hold of a gps during a trip i made this week and compared speeds everything read. when my gryphon said i was going 68, my speedo said 70, and the gps said 75. so i timed between mile markers and calculated i was doing 75.0 mph. so, that would create some issues with mpg...