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Jeramey Schaffner
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What to start with first for better fuel mileage?

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I survived my first year as a lease operator and now after finding this site and radio show I am trying to increase my profits.

I was at about 5.5 mpg last year driving at 69/70 mph with 40k to 78k vehicle gross weight in a dry van trailer with side skirts.

Since last week I droped to 60 mph and am now averaging around 7.3 mpg.

I have put a freeze plug in the egr cross over tube. And I just put on all new tires diamondback RT697...(yah wish I had found this site before buying them)

What are the biggest mpg items I can add first?

Fleetair filter

ECM tune (egr delete, mpg upgrade, horsepower)

free flow muffler system

air tabs

microblue bearings

I hear kevin talking about direct drive can I do that with 10spd with 3.58 gears? Isnt that like 9th gear at 50mph? Can i change the gears or would i have to change the whole transmission. is it even worth the mpg gain to do that?

Thanks for any help.. my goal is to hit 8.5 mph by the end of the year.

Edited by: Chris Hileman ( )

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Chris Hileman
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Get the lowest rolling resistance tires, free-flow muffler, air-tabs, and Fleet Air filter, that should get you to your goal.

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Neil Wolbeck
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I would start with the fleet air filter and a flow through muffler. Then do whatever you can to get rid of those tires if they are almost new you should be able to do ok by trading them in on low rolling resiatance tires. You will be amazed with the results.

Didnt know tire places took trade ins. I was thinking of going super single tires... they are even better on fuel economy right? These tires I have put about 12,000 miles on them already.

Jeramey Schaffner,

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David White
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I have an 07 780 with a D12 also. The Fleet Air filter and the muffler should be first on your list. Also when the flex pipe behind your turbo gets rusty (or sooner if you like) have your shop cut out the exhaust restrictor in the pipe behind the turbo (the pipe with the pyro sensor attached to it). This will help the flow a great deal. my lifetime average is ~7.7 so this is doable. I also like the OPS EcoPur and order your Wix American made QUALITY fuel, oil and HVAC filters from Fleetfilters.com (nice pricing). I can tell you what filters i use if you like. I'm well over 300,000 miles since last oil change. The plug will stop almost all soot and oil degradation.

OPS won't gain you any MPG's, unless you switch to synthetic oil, even then it is minimal gains.

Chris Hileman,

Thanks. What's your average speed and weight with 7.7mpg and what tires/gears are you using. Did you get the egr delete (ECM fix) to go along with the crossover plug.

Jeramey Schaffner,

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Kris H
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All of the above.

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David White
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Wow. I think we all know OPS isn't a fuel mileage gainer. But If you want to add engine life and save lots of labor, oil and wasted filters then it's a great help. i run about 60% light furniture loads and usually heavy backhauls home. I average 15-20 deliveries per week Indiana to Texas and back. I try to run 60 mph as much as possible with Michelin XDA Energy tires. I have 12 speed autoshift Meritor and I forgot my final gear. Haven't looked that up in a while but i know it's a weird one. ~1375 at 60 mph.

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gtookey
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Jeramy, I have a d12 with 3.58 rears also. I have done all that David suggests doing to my truck. I run my truck at 1500 rpm's which is 62mph on the GPS. My mpg ranges from 7.5 to 8.43 depending on the weight in the back and the route. My d12 seems to like the 1500 rpm spot, any lower and the turbo boosts more and my mpg falls off. I like to stay as light as possible obviously. Your direct drive gear is 9th I believe but with the 3.58 rears your road speed is going to drop down to about 52mph unless you rev the pants out of the engine. IMO 52 mph is just too dangerous a speed to run out when everyone else is going 65. Unless that is you run CA,OR or WA. I think the best return for the buck is the free flow muffler and torching out the exhaust restrictor plate. I went with the Donaldson muffler, much cheaper than the PPP one. I paid $107 incl shipping from Ryder Fleet Parts. Here's a link...

http://www.ryderfleetproducts.com/donald...

I tried the Fleet Air filter but my mpg tanked after I installed it. It seemed to make the turbo spool much more. I ran it for a week and was just not happy. I pulled it out after 5000 miles and went back to the volvo OEM one. MPG came back right away. Fortunately I got the Fleet Air from Iowa80 and they have a 30 day refund policy, so I got my money back.

If you've not had an alignment done get one and go to a shop that uses the MD Alignment system. Having all the tires working together rather than one axle working against the other two will also help on the mpg.

Edited by: gtookey ( )

Thanks for the info I'm going to try that muffler.

Jeramey Schaffner,

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kevin kaipio
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First off drive 55-60mph...cost-free

fleet air filter or K&N air filter...cost 200-300

air tabs...cost 250

low rr tires at/below 115......under 100rr even better

just these few things got me 1mpg better fuel mileage! in my world, that $10k a year

the rest you can cash flow with the increased profits youll make every month

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Rusty Allen
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I would start right away with making sure my tires are all inflated to the manufactures specs, and check them regularly, and slow down whenever possible. Some times you just can't, like your time frame isn't going to work out.

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Linn Prudhomme
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Jeramey,

I pretty much did all of the above on my 2006 D12 780 Volvo. Nothing much to add, no one mentioned the FASS system, I did that too.

Last week I did the EGR delete and a flash to the ECM with a 50 hp increase.

It pulls hills better, but I use the power I gained to enhance good driving habits.

If you let the cruise stay in especially driving 57 to 62 (where I like to stay) you will bury the boost gauge going up hill.

When approaching a hill I slowly increase speed (which hardly cost you mileage) while going down hill (building momentum), then approaching and while in the rise slowly feed throttle while climbing the hill. Watch you pyrometer and boost they tell you the story.

Doing this I did gain some mileage, I'm in a test mode and will evaluate the results and either take out the changes (I will get a refund on the upgrade in 30 days) or put in more power to handle the hills going north on I-81 In Virginia.

Update

PDQ Performance in Sanford, FL

Edited by: Linn Prudhomme ( )

Thanks. Where did you do the ecm tune?

Jeramey Schaffner,

Did free flow muffler and overhead. Muffler sounds loud coming from stock one and engine break is super loud. So far so good looks like a .2 mpg gain so far.

Jeramey Schaffner,

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