What happened to my mileage?
#1
08-20-2007, 07:21 PM
Join Date: Jul 2007
Posts: 32
Likes: 0
Received 0 Likes
on
0 Posts
What happened to my mileage?
YesterdayI put on a single cherry bomb muffler to a duel exhaust, also replaced the stock tires to larger 265/70r/17bf goodrich all terrain tires, now my overhead computer says im getting 12 mpg
and it was 16 before the mods, so is it the tires, muffler or does it maybe need re programed?
and it was 16 before the mods, so is it the tires, muffler or does it maybe need re programed?
#2
08-20-2007, 07:31 PM
RE: What happened to my mileage?
I had a 1999 Ford Expedition And went to over size tires and did the same for MPG killed it I think I went with 305 - 70 - 16 it was a 32 inch tire from a 30.7 inch tire stock it dose not take much to throw off you'r MPG 17 to 13.
On my Last truck I went from 31 inch stock to a 37.3 inch tire and regeraed it from 3.73 to 4.56 for the tires I went fron 15 to 11 MPG it's the extra Weight and takes more gas to turn them.
On my Last truck I went from 31 inch stock to a 37.3 inch tire and regeraed it from 3.73 to 4.56 for the tires I went fron 15 to 11 MPG it's the extra Weight and takes more gas to turn them.
#3
08-20-2007, 07:34 PM
#4
08-20-2007, 07:34 PM
RE: What happened to my mileage?
The answer is yes, no, yes...
Bigger tires will hurt your mileage some, but your biggest problem is that your computer thinks you're still running stock size tires, your speedo is reading slow and your mileage is showing worse than it actually is.
Re-program...
Bigger tires will hurt your mileage some, but your biggest problem is that your computer thinks you're still running stock size tires, your speedo is reading slow and your mileage is showing worse than it actually is.
Re-program...
#5
08-20-2007, 08:43 PM
Champion
Join Date: Jun 2005
Location: Minnesota
Posts: 3,775
Likes: 0
Received 0 Likes
on
0 Posts
RE: What happened to my mileage?
ORIGINAL: HammerZ71
The answer is yes, no, yes...
Bigger tires will hurt your mileage some, but your biggest problem is that your computer thinks you're still running stock size tires, your speedo is reading slow and your mileage is showing worse than it actually is.
Re-program...
The answer is yes, no, yes...
Bigger tires will hurt your mileage some, but your biggest problem is that your computer thinks you're still running stock size tires, your speedo is reading slow and your mileage is showing worse than it actually is.
Re-program...
#6
08-20-2007, 08:57 PM
DC Insider
#7
08-22-2007, 12:39 AM
Veteran
Join Date: Jul 2006
Location:
Posts: 406
Likes: 0
Received 0 Likes
on
0 Posts
Trending Topics
#8
08-22-2007, 09:42 AM
Professional
Join Date: Aug 2007
Location: New Orleans, LA
Posts: 230
Likes: 0
Received 0 Likes
on
0 Posts
RE: What happened to my mileage?
Dealership couldn't fix my speedo, had stock 33's on the 20" rims and went to 35"s and dealership told me their computer didn't have a tire size that big and that I'm stuck with the wrong tire size. Do they understand that I'm now running more mileage then what my speedo is recording? Makes my warranty last longer I guess. And I went down to 12mpg too. I've noticed if I'm doing 65mph on the interstate i'm getting about 15-16 mpg. get the truck up to 75 and it drops down to 12mpg. Glad I don't drive too far every day.