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what have you done to improve your MPG?

Finally hit $100 for a fill-up in So-Cal... sorry to say, i'm now taking the wifeys ride to work every other day... ohh the conspiracy.
 
Has anyone tried the Fitch Fuel Catalyst? If so could you post your results?

http://store.summitracing.com/partdetail.asp?autofilter=1&part=AVP%2DF3824&N=700+401348+4294908216+4294771838+4294892651+115&autoview=sku
 
I actually am looking to the Hybrid conversion.
My friend has it on his 04 F150 and LOVES it!!

FuelFromH2O

If you're in FL, here's a link for the model from the Tampa distributor
Series 14a Dual Brick Unit
The guy emailed me back quickly and said this was the recommended unit for the 5.3L V8 trucks, and also the additional pump would be highly recommended as well.
He charges $400 to install everything, but said if you're mechanically inclinded, it can be done in your driveway in a few hours.

Watch the movie clips, well worth it. My friend has been running it for almost a year now, and says it's paid for itself several times already.
 
Is your speedo corrected for the 33's?  if not, that will throw everything off.  You may be driving faster and farther than you think...
 
I am running 305/45/22's on mine...according to my Nav system, at 45 on speedo, I'm doing 47 on nav, at 60 on my speedo, I'm doing 64, and at 70 on speedo, I'm doing 76mph.

How accurate are nav systems when it comes to real time speed?

How can I correct my speedo?
 
bgruhn76 said:
I am running 305/45/22's on mine...according to my Nav system, at 45 on speedo, I'm doing 47 on nav, at 60 on my speedo, I'm doing 64, and at 70 on speedo, I'm doing 76mph.

How accurate are nav systems when it comes to real time speed?

How can I correct my speedo?


I have stock size tires and a nav system and it is very accurate to the speedo. To correct the speedo i would use a hypertech programmer or superlift makes a speedo calibration unit and I have read somewhere on here that the dealer can do it not sure about the last one though.
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and have a tuner do a custom tune on another truck, and compare the gains... the custom tune will win out every single time.  It will give twice the gains in fuel efficiency (usually 3-5 mpg) and add an additional 25-30 HP. Thats been proven time and time again with hard data. 




What is done on a custom tune that helps so much and how much should it cost?
 
A "tune" is when you have your truck's computer reprogrammed to adapt to your modifications, such as air intake, exhaust, wheels/tires, etc.

You can get a handheld tuner, and do the simple things yourself. Usually they are limited to modifying the shift points, rev limiter, shift firmess, octane, tire size, and top speed limiter. I have the Hypertech Power Programmer 3.. which from what I hear is one of the older, more basic options.

A "Custom tune" is when you have a professional tune your truck specifically to your modifications. You don't really need to have this done unless you have more major mods like air intake, exhaust/headers, cams, superchargers/turbos, etc..
 
Why did my gas mileage go right down the tube when I put my CAI on???  I have never had this happen with any of my vehicles until this one!!!

???
 
Keep your highway speed consistent/around the limit/couple of mph slower.  I'm getting ready to switch to a K&N Air filter, they supposedly help in the MPG Category.  Plus, I don't stomp the pedal through the floor from a stop.

CL
 
Besides good maintenance (ie tune up, tire pressure, etc)

Amsoil in front & rear differential (about .1 mpg)
Amsoil in engine and tranny (about .2 mpg)
Amsoil high flow, low restriction air filter (about .1mpg)
Diablo Predator, $365, (about 1.4 mpg)

Around 18.2 mpg @ 70mph
 
Alaska_AV. said:
I get 40 mpG now!

I replaced everything till I had a prius....
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Now thats funny!
 
instead of driving this year im flying its cheaper..
 
I haven't done it in my avy yet (just bought it) but in my 99 chevy 1500 z71 i had a gear vendors over under unit with the switch wired to the tow/haul button on the column shifter. basically a gear vendors over/under while not cheap turns the 4l60e / 4l80 / 700r4 into an 8 speed by adding an extra overdrive to all 4 forward gears. http://gearvendors.com/ for more detailed info but on my truck it bumped mpg up from 14 city 17 hwy to an awesome 21 city 26 hwy with only a kn filter and superchips flashpac tuner.

basically the gear vendors unit replaces the transmission extension housing and you have a driveshaft or machine shop shoten and balance your drive shaft to fit it somes with all the wiring and other parts, i had a tranny shop do mine and get it wired to my tow/haul button for more control

I will be doing the same thing in my avy along with elec fans, cold air, elec water pump, full exhaust, custom tune, plug wires, asp pulleys, and new thermostat and let ya'll know what i end up but if my old k1500 was any indication i should be able to get into the 20 mpg range hwy 
 
i have had my gear vendors over/under unit on now for 1500 miles (i drive 2 hours every round trip for work, and every weekend drive 5 hours round trip to richmond, va) and my mpg is up from about 15 mpg average to 21 mpg average. I have not added my dual elec fans or water pump yet and haven't had time to get a custom tune either so 6+ mpg with one $3500k installed upgrade is great  (y)
 
Driving style... if you want to conserve fuel and get a higher mpg, ease off the gas. Stay under 2000 rpm and treat the truck like the spoiled baby it is! I've done multiple 400 mile trips and I've gotten 22mpg out of it consistently. And this is with a 2004 Z66 2 wheel.

If you're gonna drive with your foot to the floor, be prepared to cough up the dough.

And as it was said in another post, if you're gonna drive an Avy, don't complain about the fuel milage.  :E:
 
jplumer said:
ok the point of this thread was to get away from people telling me its my driving and what actually works maintnance wise....

i drive 100 km/h on the highway 60 mph
light on the gas and im only getting 600km (375miles) out of a tank of 115 liters (30 gals) and thats all highway driving not one minute in town on a long trip.

only mod i have is 3" bl and 33" tires........now before you guys jump all over me i expect to take a hit for the tires......but it seems something isnt right

its an 02 with 115000km (70000 miles)


Does your truck have a lift?  If so, how much of a lift do you have?  Normally lifts on a truck make it less aerodynamic.  So.. my only suggestion would be to lift the truck higher, so that the tires are not covered by the truck. (if this makes sense to you???)    I have a 2006 2wd, and i get 22mpg on the freeway.  thats using cruise control, otherwise, if driving spiratically, i get a range b/t 17-20 overall.  I get 500-550 per tank. hope this helps.
just changed over to synthetic.....might do the MAF thing, tires are at 38 psi, dont use ac its canada so its cold right now 30f or so.

even tried using 3rd gear on the highway for a whole tank, someone on here said they tried it and got 22mpg.......didnt work for me


so again responces like max"s is what im looking for,
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chAVey said:
You saw Mythbusters too?  Yep, AC on with windows closed is better than AC off with windows down.  By like 5%!

Otherwise all good advice.
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I myself don't agree with the whole mythbuster approach.  Maybe if you are driving highway speeds with only the driver's window down, but remember we have a removable 4 windows and a rear window that can pop out.  I always get better MPG's with all windows down no matter what the distance or speed.


 
I have E3 sparkplugs, Royal Purple in the front and rearends, in the engine and transmission, the GM Autotrac in the transfercase, K&N Series 77 cold air intake, stock tires and suspension, empty cargo and cab, and I can only get 11 to 13 MPG driving around town like a grandpa.
I rarely travel on the highway.
I don't consider that very good mileage for what I have done to my 2002 5.3 litre powered Chevy Avalanche Z-71.
Bob.
 
K&N FIPK,  that's it!!!!!! and my mileage in town driving is horrible. Freeway driving it gets about 17 mpg. I also read in the forums where people were using the tow haul mode to increase their mileage. The only thing it did for me was decrease my mileage. Heavy foot?  oh yeah!
 
OK I'm confused how does the tow haul mode give you better mileage or what is the theory behind it I thought that you would get worse due to it controlling the transmission to help give you more power while pulling stuff. ??? I don't know I guess I don't know how the tow haul mode works exactly I guess that would be a better question. Also does it matter what axle you have I got the GU6 on my Z71 and right now I'm getting about 13.5 on highway and city but it has been steadily increasing hopefully an AEM will help out the same with my last truck.  both with power and MPG.
 
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