Join Date: Dec 2008
Location: Jersey Shore (Not Seaside!)
Thanked 214 Times in 129 Posts
When I used to commute 30 miles to work I played with a study to see if plugging in when 32f and lower would improve my mpg. It does a little with a timer I would set for 2-3 hrs before leaving. Sorry but I did not keep the spreadsheet, but for those of you from TDS may remember I kept a pretty intensive record of fuel mileage and factors.
Here was another thing I found, and maybe this was due more to my driving conditions of highway, flat road, and steady speed environment. A lot of us have noticed fuel mileage drops off during the winter, something that we normally associate with winter blend fuel. The other thing some of us notice is that coolant temp also runs a few degrees lower (commuting, low weight).
A number of years I still had a source of summer blend fuel well into January and would still see a reduction in mpg during the coldest days/weeks. By doing the old truck trick of partially blocking my radiator with a FedEx box I got my ECT back to normal without overheating (removed if heavy load) and my fuel mileage went back up to normal. I still do this but use a plastic sheet rather then cardboard as the cardboard does not like to get wet.
Again, this is with a few miles of local road and up on the parkway for steady state 65mph for 25 miles.
Formerly FMTRVT, Manager of Vehicle Testing - Brakes
2003 F-350SC Lariat 4x4 6.0L Auto
Truck Modifications as below in Pictorials on Facebook. Google - Facebook TooManyToys
Step Lights;Painted Flanges; Bypass Oil Filter; Heated Mirror Switch; Reverse Lights; 7.3L Fuel Reg Shim; 6 Disc Radio Speed Volume Mod; Coolant Filter, etc.