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Help With Gear Ratios and MPGs

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Old 09-08-2011, 02:15 AM   #1
Cortland [OP] Cortland is offline
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Help With Gear Ratios and MPGs

I currently have 265/75/16 Duratracs on my V6 Prerunner and would like to get some Camburg spindles but don't want to run 265's with a lift that large so I am debating which set up will get me the best MPG's...

Would someone who understands gear ratios please put the following options in numerical order of best to worst MPG's?

265/75/16 w/ 3.73's
265/75/16 w/ 4.10's
285/75/16 w/ 3.73's
285/75/16 w/ 4.10's
255/85/16 w/ 3.73's
255/85/16 w/ 4.10's
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Old 09-08-2011, 02:39 AM   #2
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You can play with the tire size calculator. The botom shows RPM's at different gear ratios.
Gear Ratio / RPMs for New Tire (@ 65 mph)
Better Fuel Economy Factory Ratios Increased Power

Play around with different tire sizes

tire calculator
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Old 09-09-2011, 02:48 AM   #3
Cortland [OP] Cortland is offline
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Thanks Randy.

Any other input?
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Old 09-09-2011, 08:15 AM   #4
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Quote:
Originally Posted by 4Wheelin4Banger View Post
You can play with the tire size calculator. The botom shows RPM's at different gear ratios.
Gear Ratio / RPMs for New Tire (@ 65 mph)
Better Fuel Economy Factory Ratios Increased Power

Play around with different tire sizes

tire calculator
I would be careful with that calculator. I know that my speedo/rpm don't match what the calculator states. @ 65 with my 265/75-16 my rpm's are sitting at 1940. The tire calculator shows my rpm's should be ~2574 I tend to think that this is a good calculator to use.
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Old 09-09-2011, 08:26 PM   #5
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I dont have hard facts for you on this, but i would imagine that if you just kept your stock gears and went with a skinny 33" tire, you could get some pretty good highway mileage by keeping the RPMs lower than stock while keeping your tread to pavement contact as low as possible too.
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