After spending the bucks you imagine you get some benefit. With the 29 g tank, best I every went was 350mi. Install a throttle body spacer. An over oiled filter can restrict air flow. For me the v-10 is the way to go and since you already have a truck with the v-10 you know how well they perform.
It had a 454, and the mileage was,, without a Banks, about 7. It weighed 14,000lbs ready for the road. At 62, towing it gets 14. Its amazing what great mileage everyone here gets. Keep you tire pressures at recommended levels, lighten the load in the bed, drive gently, reduce your cruising speed on the highway. My '06 is getting no plow around 10-12 in the city and around 12-14 on highways, without towing. Other than a lighter foot, properly inflated tires and clean filters, not much really.
Some on the forum suggest the 5star tune and maybe different gearing. A vortex would push fuel outward, disturbing the blend of fuel to air, possibly creating a demand for… more fuel. It is never going to be anything remotely approaching fuel efficient. I added a Banks system as soon as I bought it, before even one trip, so I can't compare before and after, but it runs pretty well up the Grapevine in California and Cabbage Hill in Oregon. I am the odd-ball, as I run the truck speed limits and sometimes less.
Install a less restrictive muffler. My wife drives my truck, it gets 10 mpg, I drive the same truck it gets 12 mpg. Usually do about 65 with it. Slowing from 75 mph to 60 will give your much more mpg than 1-4 above. I moved up to a 4x4 v-10 with the 4. The sad story is we have been getting just over 5 mpg on each of the last two trips, our first fill up was after an unknown amount of mileage. Cutting a hole would reduce air flow when it is needed the most; when you are in motion… While you are installing a less restrictive muffler, install two less restrictive catalytic converters.
My '04 gets 12-ish in town, 14-15 freeway only at about 65 mph. I figured when I bought the new one if gas stays about a dollar less per gallon than diesel, and the gas gets 2 less mpg I would save about 750. It has about 42,000 miles. At best those mods except for 3, which will do nothing will increase power. Forget about gas mileage if I do this. I think in the overall picture 5-10 is the range you will see reported. If you do my email is: Please let me know where I can get one.
I wasn't expecting much but I was hoping for around 10 mpg. Do these modifications increase fuel efficiency, if so how much? Not only will you be safer, but your mpg will increase considerably. I figured it out and I averaged 11mpg city and highway. If I encounter any hills at all it drops down 2 gears if cruise is on. Cut a hole in the panel in front of the air intake on the air filter.
The main benefit is perhaps a nicer exhaust note, music to your ears. It will not only cut your fuel consumption, but will help extend the useful life of your truck. The only thing I can see helping here would be to change the final gear ratio, but you have two differentials so that will be very expensive. For these to work one has to assume the engine designers are, basically, idiots. If I keep it off cruise and keep it from down shifting , I get 7 to 8. I usually run at about 55-57.
Coming back we averaged 5. This 2008 Ford Hurricane came with the Ford Triton V10. We have 1999 35 foot Bounder with a Banks System. I usually average about 10 tanks or fill ups to even out the driving conditions. I been drive 2 trucks 2001 F250 4wd V8 5.
What you will learn is most are not driving the same coach. Just driving 65 mph instead of 80mph will save you a considerable amount of gas, will induce less engine stress, and keep you safer. Lets say that your truck gets 12 mpg on your normal commute to and from work, which is 55 miles each day. So there is a risk you might not handle the filter properly in the cleaning and reoiling process. The more air you stuff into an engine, the more fuel gets put in to maintain the proper mixture. I'm somewhat disappointed in that however I was carrying a heavy load and climbing up through the Pocono's probably had something to do with the poor mileage. All highway is closer to 13 and I'm usually doing in the 70-80mph.