[Hi Volt]

Calculating fuel mileage should really be done over a long period. With all do respect, and if I understand your post correctly, how can you possibly look at the fuel gauge and know just how much fuel you have each time to know you went 12.5 mi further, when you don't accurately know how full your tank is each time you fill up ? ( the 3/4 point on the gauge is only one side of it ). Some will use the first click of the pump as a fill point, however the sensitivity of pumps vary greatly. I was recently on a trip and let the pump fill and stop automatically. The amount didn't seem right at all, so I kept filling... another 8 gallons ! Unless you can visually confirm a level in the tank, the best you can do is average over a long period ( not just once ). The closest I have come to a method is to fill until I hear the gurgle of the fuel hitting the base of the filler hose. Although this is not recommended on some vehicles as you can put fuel into the EVAP vent, my Tundra seems to be o.k. in this regard. This method is also not perfect but I figure the cross section of the filler hose is small enough that it will be fairly close each time. Maybe you are right, however I would try it a few more times and see if you get the same result. Your numbers add up to a change of 11 to 12 percent, if these numbers are accurate, should the mod not have dropped your economy by about 50 miles per tank when first installed ?

I however wouldn't argue that cleaning the MAF and throttle probably gave you the increases, but not removing the intake mod.