16mpg empty???
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Joined: Apr 2004
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From: Texas/Oklahoma Border
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Joined: Sep 2004
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From: Cedar Grove, New Jersey
as for correcting the speedo/ odo, if you just leave it as it is, think of it a s extending your warranty, now when something theat would normally break just after the warranty expires, you still have a few thousand miles of coverage left 
GPS unit on the dash will give you a nice number to see for speed, and a heckuva lot more accurate. Even if you borrow one to check your actual speed v indicated speed so you know, and keep it for a tanks worth, to judge distance on say 400 miles indicated vs actual.
GPS unit on the dash will give you a nice number to see for speed, and a heckuva lot more accurate. Even if you borrow one to check your actual speed v indicated speed so you know, and keep it for a tanks worth, to judge distance on say 400 miles indicated vs actual.
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Joined: Apr 2007
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From: central georgia
Mpg
I have only owned my truck for about 3 months but have put about 6k miles on it in that time. I have not had it on the interstate for any long trips because my IP has been trying to retire on me since I got the truck but, driving around town it runs fine. Run 50 or so miles at 70mph and it will act up and not run over about 50-55mph. Anyways I have 4.10 gears with 285 tires and around town driving I get between 20-23 mpg empty. I pulled a SKI Nautique for a week (350 miles) city driving and still averaged about 19.3 mpg. I do all hand calculations and don't have the overhead monitor. I am really afraid to change my IP because I am afraid my milage will go down. I know it sounds stupid but I own a Marina and hardly ever have to pull boats more than 20 miles at a time and the truck runs fine until you try to make highway trips so I am just gonna drive it until the IP poops on me.
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Joined: May 2006
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From: Tennessee
Well I am speaking of empty. I guess I need a way to adjust the speedo for the 35in. tires. But HOW? It never dawned on me. My speedo still says 70mph-2,000rpm. No change there, but maybe when my speedo says 70, I'm really doing faster, that or I'm driving more miles than what the odometer says??? Is there a way to correct this?
You can find your "correction factor" by dividing your current tire diameter by your stock tire diameter. For example, if you now have 315s and your truck came with 265s, you have approx. 35/31 which equals 1.129. Now you just have to memorize this number and multiply it by either your speedometer or odometer reading. For every 100 miles shown on your odometer, you've actually driven 112.9 and if your speedo says you're going 70, you're really going ~ 79.
This may not be too helpful with figuring your speed while going down the road, but it works for figuring your mileage at a fill-up.
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