17.8 MPG can be done with the V10.
#46
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#49
No 1.5 for tires and maybe .5 with the reading being off. Yes I believe with those tires (315's yes?) and calibration for them you're looking at 8-9 mpgs all around. The odo is off so maybe thats why you're calculating 7. These are thirsty rides and when you dig into their power they drink like crazy.
#51
A tuner will NOT improve mpg on a V10 and if it does maybe .5. But that's on a no fun economy tune. I use my truck for hauling and fun. I have a 30mpg beater car for commuting. I know you're trying hard to improve mpgs but in all honesty it's a lost cause with a V10. Add large tires and it's a near impossibility. Sorry man.
#52
Tuners CAN be great for certain things like more power for hauling that load or help shift points, but trying to get a bunch more gas mileage isn't their main purpose. You can buy a heluva lot of 87 octane gas for the 4 to 600+/- dollar cost for one of them. Then often there is the need for 91 or 93 octane at a bunch more cents per gallon also the fact that you just plain like to hammer the throttle harder to use those additional horsepower. This is a 7-8000 pound vehicle that needs lots of energy to get it going from a stop then keep that aerodynamically challenged front end splitting air(think barn door aero). And lastly, engine life - and whether any manufacturer want to admit to it, but these tuners do reduce engine life by some amount - even a so-called bullet proof 3 valve V10.
But with that said, it IS your truck to do what you feel you want
#54
Most tuners won't correct the speedo for larger tires since the ABS system in involved. A Ford dealer can correct the speedo. Then with the speedo corrected you can add the tuner which will save that new "stock" calibration.
If you are running 35's and have 3.73s on top top of that it will add a lot more load and rolling resistance for the engine and trans to deal with. The result of the engine/trans working harder will be reduced mpg by an often considerable amount. Add in hills, stop and go driving, etc and the mpg really drops. If you don't have at least 4.30 gears with 35s I would consider a gear change.
Use a GPS to obtain your miles traveled and to verify your speedo is accurate after you get it changed.
If you are running 35's and have 3.73s on top top of that it will add a lot more load and rolling resistance for the engine and trans to deal with. The result of the engine/trans working harder will be reduced mpg by an often considerable amount. Add in hills, stop and go driving, etc and the mpg really drops. If you don't have at least 4.30 gears with 35s I would consider a gear change.
Use a GPS to obtain your miles traveled and to verify your speedo is accurate after you get it changed.
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#56
That does not give the PCM the accurate information it should have. Correcting for the larger tires is the right way to do it.
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