Need help on Tire Calibration..

Reply Subscribe

Thread Tools

Search this Thread

Feb 10, 2011 | 02:27 AM

Mike-11

Thread Starter

Senior User

Joined: Aug 2008

Posts: 169

Likes: 1

Need help on Tire Calibration..

Hello Everyone in WA,

I upgraded my 17 inch stock tires and rims (LT 265 70 R17) to 18 inch tires and rims (LT 275 70 R18). I've notice that I have lost 2 miles per gallon when I changed tires. I know if I change to a 275 65 R18 I could get close to my original tires and mileage. The tires are fairly new and I don't want to wait till I change them. Gas is getting high.

I wanted to know if anyone has a Tirepaq calibration unit for a ford F250 that could help me out. I don't want to purchase a unit for a one time calibration. I know I will keep this size tire and rim for my truck. Again I was just hoping if someone could just change infomation on my truck and let me know how much you will charge.

I could meet in the Kirkland, Redmond, Bellevue, Woodinville or Seattle.

Could anyone help me out.

Thanks,

Feb 10, 2011 | 11:28 AM

lostmybeer

Have a nice Beer!!!

Joined: Nov 2006

Posts: 5,024

Likes: 1

From: WA Resident

The 70 and 65 are width of tire. Changing those really won't do much. May think about going back to the 265s if you're really worried about 2 miles. If you have 315 or 325s, then a calibration is needed.

Feb 10, 2011 | 03:23 PM

Mike-11

Thread Starter

Senior User

Joined: Aug 2008

Posts: 169

Likes: 1

Called a few tire shop and they told me that if I change to 275 65 R18 then I could get close to my mileage by 1 mile. Because I have larger tire size I'm losing about 2 miles. I know is not much but when you add it all up 2 miles times 39 gallon = 78 miles lost.

Feb 15, 2011 | 09:44 PM

lostmybeer

Have a nice Beer!!!

Joined: Nov 2006

Posts: 5,024

Likes: 1

From: WA Resident

I have access to an AE. We can make the adjustment. Quite simple to do.

Feb 19, 2011 | 07:26 PM

52 Merc

Hotshot

Joined: Oct 2009

Posts: 16,173

Likes: 4,780

From: Burbank, WA

I would guess that you aren't really getting worse gas mileage by swapping tires, especially to larger ones. What is happening is you're not registering as many miles as you did previously with shorter tires, so your odometer isn't registering all the miles you're driving. You need a speedometer calibration so it reads correctly. Either way, it's not affecting your actual fuel consumption.

On the plus side, you'll have fewer miles on it showing, at trade in time. lol

Feb 20, 2011 | 12:11 PM

onug

Cargo Master

Joined: Apr 2010

Posts: 3,274

Likes: 4

From: Seattle area

I agree with Merc. Grab a gps and go for a drive. Verify your speedo and miles driven.

Feb 22, 2011 | 08:06 AM

lostmybeer

Have a nice Beer!!!

Joined: Nov 2006

Posts: 5,024

Likes: 1

From: WA Resident

Very true. The AE will fix the issue. My OD reads 189,000+ I know I've got more miles due to the size of tire. That was before making the adjustment and live tuning. I adjusted to show that I'm going slower than I am.

Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath

Verdad Gallardo

Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

Joe Kucinski

2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

Brett Foote

Top 10 Ford Truck Tragedies

Joe Kucinski

AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make

Brett Foote

Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!

Michael S. Palmer

Ford's 2001 Explorer Sportsman Concept Looks For a New Home

Verdad Gallardo

10 Best Ford Truck Engines We Miss the Most!

Joe Kucinski

2026 Shelby F-150 Off-Road: Better Than a Raptor R?

Brett Foote

2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!

Michael S. Palmer

Mar 6, 2011 | 12:11 PM

lostmybeer

Have a nice Beer!!!

Joined: Nov 2006

Posts: 5,024

Likes: 1

From: WA Resident

AE is an auto enginuity. It does just about everything for our trucks, pulling and reseting codes, speedo adjustments, buzz and cct tests. I can meet you on the eastside if you'd like. Bellevue up through Lynnwood if you'd like.

Mar 6, 2011 | 08:27 PM

#10

Mike-11

Thread Starter

Senior User

Joined: Aug 2008

Posts: 169

Likes: 1

lostmybeer,

That will be great. What day or evening will work for you? I live in the Kirkland Area, let me know when/where you would like to meet up. Is a quick thing to do?

Mike