not necessary true, as the weight of the truck and depending on the rpms where the 342s land the truck it may be lugging which will cause worse mpg. best fuel economy is usually around 1800-2100 rpms crusing
ive gotten better mpg with 410s vs my 373s in the past
2002 Lightning - GT headed 5.5Litre w/ Twin 7665s
2002 Silverado - 427Lsx w/ Twin gt4202s
2010 Silverado crewcab Z71 - 5.3litre w/ procharger
2000 Wrangler - 5.3litre with some stance
2014 Xsport- 3.5 Eco boost
412 Motorsports
it ain't that I'm too big to listen to the rumors, It's just that I'm too damn big to pay attention to 'em..That's the difference
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