V8 Owners - What is your Avg. MPG?

[rvitek]

Originally posted by Jake's Dad
Rvitek:

Calendar is marked for memorial day weekend!

JD

Ya and DF - if I ran at 65 I'd hit the 20-22 MPG range

 

[V8BoatBuilder]

My miliage varies... In this cold new england weather with long warm up times and lots of stop and go, I'm pulling around 10-11 mpg in the city. But on long highway trips averaging 75 mph I get up to 16-17mpg.

I have a 1997 V8, with awd, running non-synthetics, halfway through the tune up.

 

[Jake's Dad]

Bump!!!

 

[Jake's Dad]

Mine dropped this week from 14.4 to 12.96.

What the???



JD

 

[rvitek]

Originally posted by Jake's Dad
Bump!!!

LOL - what are you bumping? (Post padder!)

As for your MPG drop, stop warming up your truck and invest in a hat and gloves!

Ry.

 

[Jake's Dad]

Rvitek:

Ha ha well at least I get points for being up on my game!

Really though, I rarely warm it up before taking off, I think I count to 20 - then Im off!

JD

 

[97BlackX5.0]

i have a 97 x 5.0 awd and i get about 14-15 around town and about 20 on trips... i have the 3.73 axle with limited slip i use mobil 1 10-30 bosch plat plugs and belden lifetime warranty wires and a fram air filter.... other than that the truck is bone stock....oh by the way i find a great difference in the way the truck handles from our leased 97 X that we had a few years earlier. it had the same drivetrain. the leased truck had firestones that ran at 28 psi in the front.... my current truck came with wild trac a/ts by kelley springfield that are class c load rated and run at 50 psi all around maximum.... it sure rides rougher but the handling is way way better... almost no body roll on the twistys and it helps with the fuel economy too. what kinds of tire pressures are you guys running

 

[chinx]

just got back from a roadtrip, and only avg'ed roughly 15-16 mpg =( drove across the apalachians (is that how you spell it?) though, so perhaps that's why mpg so low

i have stock size bfg all-terrain t/a's, and i run them at 38 psi on all 4's. bfg told me to run them at 40 psi, i think, 'cuz they said the tires are good up to 50 psi. the dealers, however, insisted running them at stock pressure, which i think was 32. don't want to wear out the tires unevenly, so i run them at a compromised 38. that sound about right? or should i follow bfg's advice?

 

[LowdPypes]

I just don't understand how you v8er's get such good gas mileage. I think one of you said that you were getting 20mpg on the highway. That's insane... almost double what I am getting. The only mod that has given me better gas mileage was bumping up to a 9lb pulley on the charger. Has a performance chip helped anyone's mileage...

I can buy an 03 Civic for the price of gas in my truck per month.

 

[98GT-40P]

on Michelin LTX M/S at 48psi (C load):

65-75mph on highway from Phoenix to Mexico coast and back: averaged 22.4mpg. highest one-tank average on the trip was 24.1mpg. driver + 4 passengers and rear full of suitcases.

combined city/highway: 17-19mpg.
combined city/highway with the OEM Recall Firestones at 30psi: 16-17mpg.

pulling a 4800lb travel trailer with a 93"x96" frontal area from Phoenix to Bryce to Zion to Grand Canyon to Phoenix: 13.5mpg. worst mileage ever was 12.9mpg which included multiple 4000rpm full-throttle uphill passes while pulling the trailer.

I don't know why some people's mileage is so poor. My formula is nothing special: I use 87 octane, have straight alignment, keep my tires inflated well, keep a clean air filter in, and back the accelerator pedal off a tad on the highway (just to the point where you start to loose speed) when cruising speed is reached to minimize torque converter inefficient slip.

 

[98GT-40P]

Originally posted by chinx

i have stock size bfg all-terrain t/a's, and i run them at 38 psi on all 4's. bfg told me to run them at 40 psi, i think, 'cuz they said the tires are good up to 50 psi. the dealers, however, insisted running them at stock pressure, which i think was 32. don't want to wear out the tires unevenly, so i run them at a compromised 38. that sound about right? or should i follow bfg's advice?

I'd go 42psi, even 46psi if you do alot of highway travel and no off-roading or if you're towing. Whoever told you to run your tires at 32 psi doesn't understand tires. You probably have a C load 6ply tire (maybe even 8ply -- but usually those go to 60psi). You have to add about 10psi compared to a standard load or XL (usually go to 44 psi) load tire for equivalence due to sidewall weight from the additional plies. In other words, 32psi recc on a standard load tires is the same as 42psi on the C load in terms of sidewall flex and wear patterns. BFG is probably going a little soft with a 40psi recc because the all-terrain t/a buyer is expected to see some off-road duty (or else you should have bought a more street-oriented tread) and therefore needs to be a bit on the softer side. Don't worry about wearing out the center too soon. Our trucks are pretty heavy for the tire size and I have never had a problem with uneven wear running high psi's. Hope this helps.

 

[DarkFox1]

yall run REALLY high psi in those tires.. is that safe? I thought the tire limit on most of our trucks was like 38.. I'm running 32 I think right now. the factory recommends like 28 or something

 

[98GT-40P]

Originally posted by DarkFox1
yall run REALLY high psi in those tires.. is that safe? I thought the tire limit on most of our trucks was like 38.. I'm running 32 I think right now. the factory recommends like 28 or something

Safe is determined by the tire on the rim, not the factory recc. The factory makes it recc based on the OEM tire, which may or may not be what you have. It is not safe to exceed the tire manufacturers max cold inflation pressure and I do not support doing that at any time.

Running 32psi is probably perfect if your tire's max cold psi rating is 35psi. 32psi would be severly underinflating, for example, an E load (10 ply) tire (max psi is 80), no matter what the factory recc was -- the rim would probably hit the ground on bumps.

 

[DarkFox1]

I'm on michelin LTX M/S 235/75R15 on 15x7s I dont know anything about the tire, it was a free swap off the firestones..

 

[LowdPypes]

so running 285/60R18's is prob not the best for mileage, huh... LMAO

 

[Jake's Dad]

DarkFox:

What PSI do you inflate yout tires?? I have the same tires on my truck. Just curious. I know there has been a an update by Ford as to what PSI they sould be inflated to, but I dont know what.

Any ideas?

JD:redexp:

 

[DarkFox1]

well I dunno lowdpypes.. these people are getting extreme mileage in comparison here.. I know I have a lead foot but.... yea..

I run my tires at 32 psi or so

 

[2K_Limited]

I get 16 MPG - 5.0 AWD.

Chris

 

[Jake's Dad]

Took it easy (cruise at 75 instead of 80), and got 14.93 MPG this time.

JD

 

[98GT-40P]

Originally posted by LowdPypes
so running 285/60R18's is prob not the best for mileage, huh... LMAO

Probably not! hahaha 285mm section width, only 60% for sidewalls.... sounds like alot of friction to the street (but therefore better street traction).

If you're running a blower, did they replace your injectors to 24lb's or 30lb's to and/or the fuel mapping to richen it up? That could also explain some fuel economy woes.

Also, when you hit the juice, doesn't the ZEX computer richen it up too?