stock ratio. i wanna say 3.73 but dont quote me, i'll have to check it out ha. well, i imagine my new tires dont help it any, i just put on a set of 305/60R18 Dick Cepek fun country 2's. but does the EGR
delete help with mileage at all? just wondering. if so i'll be sure to get on it quicker, just been short for time with farmin bein main priority
I don't know on the EGR
delete. Some say it does, others seem to not be concerned, and others seem to say no difference. I think that some tuners can be set to reduce the EGR
once it has warmed up the coolant, which could be a good use of all the heat in the exhaust after start up when the engine is cold.
My current van has an average MPG
of just under 19MPG. I've got the stock sized tires, and the rear gear ratio is 3:55...automatic transmission. I don't do a lot of hauling, and I don't use the van like I used my other vans. I bought this one well used...a survivor...with 398k. EGR
did need to be replaced. Seems to run strong. I had two 7.3's before, and the 6.0 scared me, but I'm doing better now...at least I keep telling myself that.
At speeds just below 60MPH, I think the engine turns just under 1700RPM's. And at just below 70MPH, the engine R's are under 2000 yet, if I remember correctly from my drive home.
I've put on taller, wider tires on my one van, the bus, and, while it allowed me to reduce the engine RPM's at the same speed, I saw a reduction in my MPG
. I figured that was the result of all, some, or one (or none) of the following: van became too tall and increased wind resistance, van was too tall and too much air was going under van that increased drag, larger tires had extra weight that took more power to move, larger tires had extra width that increased wind resistance.
If I'm going to make a change this time around, one might be in going to a narrower tire with the same diameter. The stock tire is a 245/75R16, and I'd consider a 215/85R16. Weight would be reduced, and width would be reduced while maintaining the current "as designed" gear ratio and overall height.
Considering ideas on building an air dam.
I enjoy the stuff made by DP
Tuner. I think their programs has a little better shift strategy than stock strategies...seems like the OEM ones don't lock up the torque converter soon enough and they hold the RPM's out pretty high before shifting...my thoughts at least. A manual transmission would be ideal, but converting a van would be an expense that I don't want to tackle.