37' tires M.P.G. posts please

[2slo4now]

My fuel ecomomy is pretty bad. I don't mind spending the money but stopping every 2 hours on a highway trip sucks. It seems that that my mileage really suffered when I went 3 inches taller with the truck and installed some 37 inch tires.

All highway trip yesterday 210 miles ran out of gas. My reserve lasted 21 miles. My computer and my calculations indicate low 6 MPG. 80-85 mph 6 people and gear. I know the supercharger doesn't help.

If you are running 37s please post what your MPG is.

Thanks

Dan from Alabama

[2slo4now]

My fuel ecomomy is pretty bad. I don't mind spending the money but stopping every 2 hours on a highway trip sucks. It seems that that my mileage really suffered when I went 3 inches taller with the truck and installed some 37 inch tires.

All highway trip yesterday 210 miles ran out of gas. My reserve lasted 21 miles. My computer and my calculations indicate low 6 MPG. 80-85 mph 6 people and gear. I know the supercharger doesn't help.

If you are running 37s please post what your MPG is.

Thanks

Dan from Alabama

[kdio]

My best MPG was from LA to SAC about 450 miles and averaged 15.9 MPG at 78 MPH average speed. Typically I get about 13 MPG on Highway and combined 11.5 to 12 MPG.

03 H2 Sunset Orange Polished Magna Charger w headers & cold air intake, 37" MTRs w Weld Mountain Crushers, GPS Nav. & 2 rear LCD TVs w DVD, Extreme Tube steps

[2slo4now]

Thanks Kdio

That is what I wanted to hear. Guess I need to send the flash tuner back for a reprogram.

Dan

[Joe]

I had MTR's on my truck for several months and my mileage did not drop drastically. 10.4 to 10.6 average, which is about where I was give or take .2 miles with the stock 35's.

Sound like you have another issue. The tuner might be running really rich. How's the engine running?

2001 H1 Opentop

Former 03 H2 Adventure Series

http://homepage.mac.com/babiak1/

[unaslob]

something is definitely wrong.. you are probably running too rich, i would go with the reprogram.

I would expect a notable decrease with the extra 3" lift. do you have anthing up top??? roof rack wise?? 80-85 is a good clip for the h2, I find that running a bit slower makes a huge difference in the mileage.. your rig is probably downshifting a ton to keep your speed, that devours the gas. I run low 70's and get much better mileage. but i do have stuff up top that decreases my mileage.

unaslob

Corsa Sport exhaust(offroad 'tip'), Gobi rack w/ lights & w/roof mounted tire w/ ladder, Warn Winch with rear power, Dual Wolo Airhorns w/ lanyard valve, Hadley Aircompressor 130PSI, 14" airtank, front and rear quick disconnects for air, Cobra 75 WX CB, Dual 4' Firestik fiberglass whips, front tinted windows, 7" Homer Simpson decal (teehee)!

[Bighammer]

2slo,
I'm getting 13 on the highway at 75 mph. In a head wind it will be less. When I run the cruise control I generally get less also. The supercharger did flatten out the highway with less downshifting. Just the torque converter unlocks now. Around town I'm getting maybe 10 to 10 1/2. I am not running a lift or larger tires.

CG

Yellow H2 Lux-Borla Cat Back-Magna Charger

[TG]

I run 37" Super Swampers and get 11.6 MPG, mostly in town driving, with stock tires I got 11.7 MPG, so no real difference. I couldn't get over how QUITE these tires are, and they look so much better than stock!
Cheers,
Tim

[Centerfire]

This may be a silly question. BUt did you recalibrate your computer for the taller tires. Otherwise all your spped and mileage calculations are way off.?? 2-3 " more tire height will make a marked difference.

I have a question: Did you put lift on to fit taller tires. ifnot do you have the rear air suspension?

Mike

[2slo4now]

Thanks everyone

My mileage does improve to 9.2 at 70 mph. I am recalibrated for taller tires. I do have a light bar with 10 daylighters. I do have a 3 inch lift kit with air ride.

Dan from Alabama

[Centerfire]

Well allright then. Thanks for info.. I would like to add a little bigger tire.. Jut do not wish to got the way of lifting.. So I will just go with what I. Thanks again

Mike

[ANGELO D.]

I HAVE 37IN TIRES, 456/GEARS, SUPER CHARGER, HEADERS, CORSA SPORT EXHAUST, AND SPECIAL CAM
PACKAGE. I JUST GOT BACK FROM TRIP TO NEVADA MOSTLY ALL HIGHWAY DRIVING, HAD 4/ADULTS AND 1/DOG, AVERAGE SPEED 80/MPH AND 600/MILES LATER I AVERAGED 10.00/MPG. WHEN DRIVING IN THE CITY I AVERAGE 9.2MPG. DEFINATELY SOUNDS LIKE YOUR MILEAGE IS VERY POOR.

[H2 Daddy]

2slo
Is your lift really 3"? I thought the only lift available was a 4" or 6". If so, what is the brand and where did you get it?

[JamesT]

Hi...I have a 6" lift and I run BFG 37's and get 10.6. I also installed a HYPERTECH Power Programer. Something is wrong!

<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR>Originally posted by 2slo4now:
My fuel ecomomy is pretty bad. I don't mind spending the money but stopping every 2 hours on a highway trip sucks. It seems that that my mileage really suffered when I went 3 inches taller with the truck and installed some 37 inch tires.

All highway trip yesterday 210 miles ran out of gas. My reserve lasted 21 miles. My computer and my calculations indicate low 6 MPG. 80-85 mph 6 people and gear. I know the supercharger doesn't help.

If you are running 37s please post what your MPG is.

Thanks

Dan from Alabama<HR></BLOCKQUOTE>

[Hum2]

I want a cheap 2" lift...anyone know of one?

Ric

OMAHOG/IHOG
Hum2@cox.net

[Hum2]

I will go to the 37" when my BFG stocks wear out.

Ric

OMAHOG/IHOG
Hum2@cox.net