Gas Consuption with different Tires

[AlexJet]

After making some discussions on the forum, I think this thread may help other members to see the real numbers for gas consumption in different Tires/Lift options. Some of us gone extreme (me, Andries) for 35" tires, majority stayed at the level of 33" tire, but has different lifts. You can post your consumption data along with your Tires/Lift combo for comparison.

THIS IS OUR PERSONAL EXPERIENCE AND YOU MAY NOT HAVE THE SAME NUMBERS IF YOU"LL PERFORM SIMILAR MODIFICATIONS.

[AlexJet]

Truck: 2005 V6 Limited

Option 1

Tires: 265/65-R17 Dunlop Grandtrek AT20
Suspension: stock

Gas Consumption:
- City -- 13l/100km (18mpg)
- Highway at 70mph -- 10l/100km (24mpg)

Option 2

Tires: 265/70-R17 Bridgestone A/T REVO
Suspension: 3+2" Cornfed

Gas Consumption:
- City -- 15l/100km (16mpg)
- Highway at 70mph -- 12l/100km (20mpg)

Option 3

Tires: 285/70-R17 GoodYear MT/R
Suspension: 3.5" OME 886/896, N140s/N141

Gas Consumption:
- City -- 16.5l/100km (14mpg)
- Highway at 70mph -- 14l/100km (17mpg)

Option 4

Tires: 315/70-R17 ProComp Xtreme MT
Suspension: Custom 7" with drop bracket

Gas Consumption:
- City -- 19.5l/100km (12mpg)
- Highway at 70mph -- 17.5l/100km (13mpg)

Tested:
Tires: 35x12.50-R17 ProComp All-Terrain (stock 3.73 gears)
Suspension: Custom 7" with drop bracket

Gas Consumption:
- City -- 18.4 l/100km (12.8mpg) verified
- Highway at 70mph -- 15.8 l/100km (14.7 mpg) verified

[Mikestang]

Average over about 1000 miles, mix of city and highway.

265/75/16 Khumo MTs - 16.6mpg
265/75/16 Goodyear SA ATs - 17.1mpg

[JAM07Sport]

v6
Stock tires
2in leveling kit
Arb bumper
19.5 city
26 highway
Highway was 360 miles non stop at 55-65mph no hills no traffic just steady crusing. I had some one else check the numbers because I did not belive it either.

Same vehicle with 3/2 lift
18.75 very consistant city
19 highway
High way was 70-80mph for 220miles straight I think I would have been better if I would have kept it around 65 but I was just going with the flow in the slow lane.

I am very interested to see the results because I plan to get 285's but I may get 265/70 if I am going to lose 4mpg. It already costs 70 bucks a week in fuel. minus 4mpg thats like20-30 more $ a week. Heck one month and bigger tires wont matter I wont have the money to get a permit to the OHV park.:eek:

[JAM07Sport]

I found a caculator and simplified the conversion for accurate fuel consumption

On 265/70-17 0r 265/75-16 for every 28 miles on the stock O/D you have really traveled 29 miles.

On 285's for every 14 miles on the stock O/D you have really traveled 15 miles.

On 315/70-17 for every 8 miles on the stock O/D you have really traveled 9 miles.

[B]THIS IS WITH THE STOCK 3.73 REAR [B]

So for 285's say you drove 400miles and put 22 gallons of gas in.
400/14=28.5 then 400+28.5=428.5 then 428.5/22=19.5 rounded off

I am pretty sure this is right :rolleyes: :confused: Someone check me but I pretty sure its right.

[AlexJet]

Your calculation is right.
As of additional mpg. If you see my post before I had 265/70 Revos with 20mpg (highway) and 285/70 MT/Rs with 17mpg (highway as well). This is 3mpg difference, but you should also take in consideration that one tire is AT and another MT.
Right now I have 315/70 ProComp Xtreme MT for summer and 35x12.50 ProComp AllTerrain for winter. Both tires are similar in size (35"). I didn't drive much on the highway on ATs, but so far it seems to me that the difference between them will be around 1.5-2mpg. I'd have to double check it.
Based on my personal experience, I'd say that jumping from 265/70 to 285/70 on the same tire (!) you'd loose ~1-2mpg in real life (not calculated by in-dash computer, because he will be getting unreal distance).

[JAM07Sport]

Your calculation is right.
As of additional mpg. If you see my post before I had 265/70 Revos with 20mpg (highway) and 285/70 MT/Rs with 17mpg (highway as well). This is 3mpg difference, but you should also take in consideration that one tire is AT and another MT.
Right now I have 315/70 ProComp Xtreme MT for summer and 35x12.50 ProComp AllTerrain for winter. Both tires are similar in size (35"). I didn't drive much on the highway on ATs, but so far it seems to me that the difference between them will be around 1.5-2mpg. I'd have to double check it.
Based on my personal experience, I'd say that jumping from 265/70 to 285/70 on the same tire (!) you'd loose ~1-2mpg in real life (not calculated by in-dash computer, because he will be getting unreal distance).

I was just trying to give everyone a distance conversion so some one is not giving wrong info because they are going off the factory O/D with bigger tires. Their milage would look low but really not be that low because they wernt converting the actual distance traveled.

[Teampez]

AlexJet,
are them numbers you posted with "stock" gears ?

after I lift mine, Ill want to regear and get it back to as close to stock as poss. but Ive got the V8 if it makes a diiference.

[AlexJet]

AlexJet,
are them numbers you posted with "stock" gears ?

after I lift mine, Ill want to regear and get it back to as close to stock as poss. but Ive got the V8 if it makes a diiference.

Gas Consumption:
- City -- 18.4 l/100km (12.8mpg) 3.73
- Highway at 70mph -- 15.8 l/100km (14.7 mpg) 3.73
- City -- 17.5 l/100km (13.5mpg) 4.56
- Highway at 70mph -- 16.2 l/100km (14.5 mpg) 4.56

[Teampez]

Gas Consumption:
- City -- 18.4 l/100km (12.8mpg) 3.73
- Highway at 70mph -- 15.8 l/100km (14.7 mpg) 3.73
- City -- 17.5 l/100km (13.5mpg) 4.56
- Highway at 70mph -- 16.2 l/100km (14.5 mpg) 4.56

duh, now dont I feel "stupid"

[AlexJet]

After my recent upgrade to Gibson Exhaust, JBA headers, URD Y-pipe and eliminating 2 out of 4 cats, I've got surprisely good results on the highway. Had a trip back and forward ~400miles all over the highway. I got 14.3 l/100km (16.5mpg) doing 65-70mph.

[Fumbler]

2003 V8 SR5 4WD 4Runner with 77k miles...
These are approximate miles per gallon.

Factory suspension, stock Dunlop Grandtrek P265/70/R16:
Highway 70-80 mph: 17 mpg
Highway 55-60 mph: 18-19 mpg
Around town 30-50 mph: 14-15 mpg

Factory suspension, Goodyear Wrangler Silent Armor P265/75/R16 @38 psi
(mileage difference due to tire size accounted for):
Highway 70-80 mph: 15-16 mpg
Highway 55-60 mph: 17-18.5 mpg
Around town 30-50 mph: 12-14 mpg

The larger, heavier tires definately eat up more fuel.
I have noticed they are a lot more sensative to driving style in regards to mpg. I have to take it easy with these if I want decent mpg.

The worst I've recorded with the Goodyear SAs has been 11mpg of strictly home to office driving. That's a rough commute for a vehicle because it's only 1.5 miles of stop and go each way. The best I've recorded was 18.5 mpg on flat 55mph highways.

With factory Dunlops the worst was 12.5 mpg back and forth to work.
The best was 20 mpg...which was strange because I had my 4R completely loaded on a camping trip. We were traveling downhill though at 1500-3000 ft altitude. I live at 150-250 ft altitude.