~10MPG consistently in town (1 Viewer)

[aa2300]

Hi All,

On my second 100 series. My last one ('98) I remember getting ~13-14MPG pretty regularly driving around town with a bit of highway thrown in. That rig had front/rear bumpers, full armor, drawers, 4.88gears..in theory the thirstier of the two trucks.
My new (to me) '99 consistently gets 10mpg. Front bumper and 33s only. I am hitting more stoplights in Seattle then I was when we lived out in Spokane. But the difference seems way out of line. Am I just not remembering things correctly? Any thing to check for that might have it running so inefficiently?

Cheers

 

[BillZ260]

I get 10.5 on the hwy...

 

[Tanner H]

air filter, plugs, coil packs replaced any time soon? might be time to baseline all those. I also run 40psi for highway/city driving.

 

[geanes]

How are you calculating the mpg? Was the speedo in your previous rig adjusted for the tire size discrepancy? Is your current one? My 98LX is on 33s with front and rear bumpers, sliders, roof rack and drawer system without any regearing (4-speed, 4.3 gears I believe). I routinely get 10-11mpg in town (Austin) and as much as 13 on highways. Those mpg numbers are based off a recalibrated speedo.

 

[aa2300]

How are you calculating the mpg? Was the speedo in your previous rig adjusted for the tire size discrepancy? Is your current one? My 98LX is on 33s with front and rear bumpers, sliders, roof rack and drawer system without any regearing (4-speed, 4.3 gears I believe). I routinely get 10-11mpg in town (Austin) and as much as 13 on highways. Those mpg numbers are based off a recalibrated speedo.

I hadn't thought of that at all. No idea if the last one was corrected for or not. I've simply been dividing the miles on the trip meter by the number of gallons I'm putting in. Definitely no correction on the new one.

 

[geanes]

I hadn't thought of that at all. No idea if the last one was corrected for or not. I've simply been dividing the miles on the trip meter by the number of gallons I'm putting in. Definitely no correction on the new one.

Yeah, if mine wasn't corrected, I'd be in the 8-9mpg range in town. Also, I'd be going 75 on an indicated 70mph

 

[LXFAM]

@geanes might have answered your question. With larger tires, the speedo will be reading higher than your actual speed. This will lead to a higher trip mileage and throw off the MPG number.

Other than that, have you baselined the truck? synthetic oils? tranny, diff, and transfer case fluids? clean throttle body? spark plugs?

i average about 13-14 in NYC stop and go (highways are 45mph at best) and about 17 on the actual freeway outside the city (65-75mph).

 

[biggus]

New O2 sensors can help fuel economy as well.

 

[jlm43]

I went up one size to the more common 275/65-18 and I'm still getting around 16 mpg for everyday driving. No other mods so it's completely stock.

@geanes might have answered your question. With larger tires, the speedo will be reading higher than your actual speed. This will lead to a higher trip mileage and throw off the MPG number.

It's actually the opposite. Since the tire is larger and has a greater circumference, it will travel a greater difference per revolution than the truck is calibrated for. Thus making your speedometer and odometer read lower than normal. I did the math (correctly, I think) when I went to 275/65's from 275/60's and the multiplier is 1.0343 for that change. I take my trip mileage and multiply by 1.0343 then divide by the gallons required to fill it.

 

[nissanh]

I had 12 mpg (highway) right after purchasing the truck, but after getting Denso TT platinum plugs, ALL OEM (but not new) coil packs, NEW fuel, oil and air filters, new oil all around, OEM brake pads/fluid all around, 276 75 16 AT (Pathfinder) tires at 29 psi and I am getting 15-16 MPG at 72 MPH and 11-12 MPG in the city (3 mile one way). Cruiser gives me a better gas mileage than my 3rd gen 4runner in the city!

 

[2001LC]

I had 12 mpg (highway) right after purchasing the truck, but after getting Denso TT platinum plugs, ALL OEM (but not new) coil packs, NEW fuel, oil and air filters, new oil all around, OEM brake pads/fluid all around, 276 75 16 AT (Pathfinder) tires at 29 psi and I am getting 15-16 MPG at 72 MPH and 11-12 MPG in the city (3 mile one way). Cruiser gives me a better gas mileage than my 3rd gen 4runner in the city!

"NEW fuel" ?

 

[ScubaJon]

it says new fuel air and oil filters so I assume the fuel would be a fuel filter

"NEW fuel" ?

 

[2001LC]

OH, you're right ..DUH

 

[KraziAzn]

33" and sliders. 10-11 City, 13-15 HWY, mixed 12ish MPG

 

[DuckLN]

There is much discussion and wisdom recorded on a mpg thread.

First, if you post mpg make sure and post “aftd mpg” - adjusted for tire diameter - otherwise you arent comparing apples to apples.