Gear Ratio??? Got bigger tires losing MPG, HP

Sorry guys took me so long i havent had a chance to check my comp.

I didn't adjust for the difference i am just watching the gas tank drop. Can you explain what you mean by adjusting the figures. I have kept it in 4th today on the highway and it was reving around 2.4 - 2.5 rpm so it wasn't dropping as dramatically as before. But i do think i need to throw some gears in becuase 5th gear is obsolete right now. The other thing was can you switch the 2.7 4.1 gears from the pre runner into my tacoma or is it a completly different setup, havent really looked into it that much yet.

 

You have to adjust your mileage by the difference in the tire circumference. Your new tires will be a % larger than the old tires. This means that the tire takes fewer rotations per mile. Therefore, your odometer will read fewer miles than you have actually driven and your speedo will read slow. Multiply that percentage by the amount of miles you have driven to get the true number of miles driven and then recalculate your gas mileage. You may be able to just multiply your gas mileage by the % but I can't say for sure.

This doesn't mean you don't need to regear, it just means your gas mileage may not be as bad as you think.

 

I'm very new to this still, but learn quickly. I just want to make sure I have an understanding of what to expect when I bolt on my bigger tires.
Once I have all the parts, I will be installing a lift of ~ 3" front and 2" rear (bilstein 5100s with OME 887 coils and AAL). I'll be going from my factory 265/70R16 (30.6") to a 265/70R18 (32.6").
My Taco has the A04C (4.56) differential gearing and the A750F transmission.
Based on most of the online calculators, the truck came stock with power in mind and could have been missing out on some MPGs. I usually get 17 MPG with stock everything.
Based again on the online calculators, a 2" bigger tire should put me more in the realm of a daily driver with a more balanced power/MPG profile. New effective gear ratio of 4.28 with tire size taken into account.

Should this new effective gear ratio of 4.28 end up being a better fit for a daily driver? Truck commutes 70 miles round trip (all interstate and only ~3 days a week thankfully)

 

Worth the bigger tires your odometer is off....are you compensating for this in calc your mpg