Looking for some real world input from you folks... trying to make some decisions about my truck and regearing might be an option. Considering the direction gas prices are going, I want to have some idea what to expect should I end up regearing.

So, my questions for you...

What year is your truck?
What tires are you running (size and type)?
Auto or manual transmission?
What gearing are you running?
What's your typical gas mileage?
What's your typical driving like (all highway, aggressive, lots of towing, etc.)?

Thanks everyone.

 

96
315/75 Yoko AT
Manual
4.88
17
mostly highway non-aggressive

 

What year is your truck?
2002

What tires are you running (size and type)?
315/75/16 MTR

Auto or manual transmission?
Auto

What gearing are you running?
4.88

What's your typical gas mileage?
15-17mpg

What's your typical driving like (all highway, aggressive, lots of towing, etc.)?
More than half highway, a bit agressive, no towing.

 

What year is your truck?
96
What tires are you running (size and type)?
285/75 Revo
Auto or manual transmission?
Automatic
What gearing are you running?
4.88
What's your typical gas mileage?
I get roughly 180-200 miles per tank now on summer gas. So I calculated roughly 16 mpg city, 18 mpg highway
What's your typical driving like (all highway, aggressive, lots of towing, etc.)?
I seriously drive like a grandma.

 

[QUOTE=jacksonpt]Looking for some real world input from you folks... trying to make some decisions about my truck and regearing might be an option. Considering the direction gas prices are going, I want to have some idea what to expect should I end up regearing.

So, my questions for you...

What year is your truck?

1999 V6

What tires are you running (size and type)?

285/75/16 BFG MT

Auto or manual transmission?

Manual

What gearing are you running?

4.88

What's your typical gas mileage?

16-17 if I'm under 65-70 mph, 14-15 over 70 mph, 12 when towing 3600lb camper at 60-70 mph

What's your typical driving like (all highway, aggressive, lots of towing, etc.)?

Average-seperated out the towing mpg, also note that I have a roofrack and a spare 285 on the roof when towing, spare goes in the back when not towing

 

What year is your truck?
2001
What tires are you running (size and type)?
285/75R16 BFG A/Ts on OEM 16x7s
Auto or manual transmission?
Auto
What gearing are you running?
4.88
What's your typical gas mileage?
17-18 MPG
What's your typical driving like (all highway, aggressive, lots of towing, etc.)?
Non-aggressive mix of highway and city driving between home and C. Springs with no towing. The elevations are between 6000' and 8500' so that might make affect it some.

 

Ok, well I know i'm not regeared, but my gears are bigger than yours so I thought I would add some input

What year is your truck?
2000

What tires are you running (size and type)?
285/75R16 MTR's American racing 16x8s

Auto or manual transmission?
Auto

What gearing are you running?
4.10

What's your typical gas mileage?
13 city 14 highway

What's your typical driving like (all highway, aggressive, lots of towing, etc.)?
No towing at all, rear seats removed, 90% city, fairly to more fairly aggressive

 

Thought I'd just do this just cause...

What year is your truck?
1996

What tires are you running (size and type)?
315/75/R16 Goodyear MTR's

Auto or manual transmission?
Auto

What gearing are you running?
4.30

What's your typical gas mileage?
12-City, 16 Hiway

What's your typical driving like (all highway, aggressive, lots of towing, etc.)?
Grandma driving. I drive very slow, since I have too much lift and no swaybars. I go about 70mph on the hiway and get 16mpg everytime.

I had no idea that guys running 4.88's with 315's are getting similar gas mileage. I thought it would definetly be increased?!

 

What year is your truck?

1996 w/supercharger

What tires are you running (size and type)?

35X12.50R17

Auto or manual transmission?

Auto

What gearing are you running?

4.88

What's your typical gas mileage?

15 mpg overall

What's your typical driving like (all highway, aggressive, lots of towing, etc.)?

40% highway, 40% City, 20% towing... and 50/50% aggressive/not aggressive

 

> What year is your truck?

2001

> What tires are you running (size and type)?

285, Bridgestone Dueler Revo's

> Auto or manual transmission?

Auto

> What gearing are you running?

4.56

> What's your typical gas mileage?

16mpg - city (mix)
18mpg - highway only

> What's your typical driving like (all highway, aggressive, lots of towing, etc.)?

Mix of highway and street.
Not aggressive... maybe except for highway ramps some times
No towing, but:
- ARB bumper and 12K winch up front
- 2 TrailCarnage skid plates (1/4" steel)
- RockSliderZ
- SonoranSteel bumper in the rear
- Trunk full of heavy gear

 

Basically going from 4.11 to 4.88 is (very roughly) proportional to the switch from 31's to 35's (both up 2 sizes). I got what I expected - similar gas mileage (all things being equal) and similar performance in terms of torque off the line, etc.

I actually get better than 17 mpg depending on time of year. That is average. Blasting AC in Phoenix heat can hurt my economy during the summer months.

 

OK, so what I'm getting from this thread and some posts I found while searching, there isn't enough of a mpg gain to justify regearing. Granted, I'd regear for other reasons, but the mpg could have proved to be a justification for my wife.

I have 33" MTs with the stock 3.90s (1996 V6 auto) and get 14-15mpg. I wasn't hoping for miracles, but was hoping I might get close to 17-18mpg.

 

i get 17-18 on the highway...

What year is your truck? 1999 Limited
What tires are you running (size and type)? 305/70-16 MT/R's (33/12.50's)
Auto or manual transmission? Auto
What gearing are you running? 4.56 Yukons
What's your typical gas mileage? 16 MPG City and 17-18 Highway
What's your typical driving like (all highway, aggressive, lots of towing, etc.)? Mostly Highway, NOT-aggressive, NO TOWING, but I do have a ton of extra weight - sliders, ARB Lockers (rotational mass), 8" wide wheels (more rotational mass), Front & Rear bumpers, Winch, Sub w/ Box, and typically loaded to the gills with luggage, etc. I'm not a granny, but I don't get on it. I typically stay around 75-78 MPH on the highway and get a consistent 17-17.5 MPG and an occasional 18 MPG if the terrain is flat. It's pretty hilly here in E-Tenn and on our trips for the first 200-300 miles when heading south, then it flattens out a little, but still not extremely flat.

 

Seems like if you stuck to the 33's and went to 4.56, you can get to the 17 mpg range, no? What am I missing?

 

I regeared because I got huge tires not because I wanted better gas mileage. If you want good gas mileage, keep 3.90 or 4.11 and get a 30" tire, IMO.

 

99
stock tires
auto
stock gears
aggressive driving
i get about 11mpg. now a little more but im getting m/t

oh and ive got about 147K miles

 

^ you might want to check some things. thats not normal.

same as insr5runner....stock gears, but giving you some more numbers:

99 supercharged
305/70/16 m/t's
manual
4.10's
15.8 mpg avg. all together, dont know how it breaks down
80% city, 20% highway

by the way, i cleaned my throttle body and got 1mpg increase.

 

Cleaning the MAF/air-filter, TB, sparkplugs and oil change I did get an increase.

 

you should consider swapping out your front O2 sensor. my MPG tanked like that and i swapped it out for less than $100 (http://www.urdusa.com) and the MPG jumped back up to 17-18 range. it was "bad", but not bad enough to throw a code.