Originally Posted by TVL
I don't put much stock in manufacturers claims of gas mileage. They hire professional drivers and every detail in their testing environment is "ideal". It has nothing to do with real life driving. jmho
This is certainly true, but more significantly,
the "cycle" that is tested is VERY conservative in both speeds and acceleration.
If you drove 'the cycle' then you should actually get *better* than the Label FE
(25 mpg highway for 2WD US 3.6 8-spd 1500)
since the actual test data is reduced 22% to calculate the 'Label' FE.
but the highway cycle is averaging only 48mph with a top speed of 60mph,
so you have to modify your driving habits
more info on the US EPA test cycles here
also EVERY OPTION you add to your truck (besides 8-spd, 3.21 axle, and tonneau cover) will REDUCE your fuel economy.
the big hitters are 3.55 & 3.92 (ouch!) axles, the extra 500# for a crew cab, the off-road tires... of course 4x4 ..