Compression Ignition Addict
Join Date: Nov 2006
Location: Prosser WA
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Questions about my milage
So I've been averaging around 14.5-15 highway mpg since I bought my rig last July with 74,000 miles on er. I've also been using powerservice on every fill up since last November. My first question is, should I recalubrate my speedo for 285/75R16 tires and if so will my odometer start reading the correct miles after I do this? I try to hand calculate my milage after every fill up and figure since I haven't done the recalubration then I'm actually getting a little better milage then what I am showing (is this right?).
Also, last weekend I went on trip over the cascades and I got my usual average using powerservice and traveling at speeds of 65-70 mph. The truck currently has 84,000 miles on er. I again filled up at a Safeway on the westside before heading home without using an addative and actually averaged 17 mpg on the way home traveling 75-80 mph on the mountain pass. Wind was not a factor too and from the westside. As you can guess the milage was a big surprise to me and I'm trying to figure out why it went up? Is it possible that in my neck of Washington that we are still using a winter blend of diesel, or do different areas (same station though) use a better quality of fuel?
Sorry for being long winded but any answers to my questions would be much appreciated.
03 F350 6.0L FX4 CC SRW Long Bed
Bully Stainless Steel Nerf Bars, 285/75R16 Toyo Open Country MTs, 2.5" Tuff Country Leveling Kit, Delta Tool Box, Ford Drop in Bed Liner, Folding Gooseneck Hitch (unknown), HFCM Drain Plug (IH), AFE 4" SS TB Exhaust w/5" SS Tip