mikej Posted October 7, 2009 Share Posted October 7, 2009 I have done everything I can think of to get this truck to pull better or atleast get better fuel mileage and nothing works, I have ran overhead, changed fuel pressure reg, changed fuel pick up pump, changed after cooler,changed boots, nothing seems to help getting a little less than 4 mpg and losing 10 to 20 mph on normal hills loaded or empty, is this normal for an e-tech e7 427 ? Quote Link to comment https://www.bigmacktrucks.com/topic/10966-power-and-fuel-mileage/ Share on other sites More sharing options...
fjh Posted October 8, 2009 Share Posted October 8, 2009 Is the turbo wastgated ?What kind of pyro numbers do you see loaded! Quote Link to comment https://www.bigmacktrucks.com/topic/10966-power-and-fuel-mileage/#findComment-41566 Share on other sites More sharing options...
bts-4120 Posted October 9, 2009 Share Posted October 9, 2009 did you look at the air filter, and what are you pulling, its been easy to avage mid to upper 7's with mine here lately Quote Link to comment https://www.bigmacktrucks.com/topic/10966-power-and-fuel-mileage/#findComment-41639 Share on other sites More sharing options...
Mackpro Posted October 9, 2009 Share Posted October 9, 2009 I have done everything I can think of to get this truck to pull better or atleast get better fuel mileage and nothing works, I have ran overhead, changed fuel pressure reg, changed fuel pick up pump, changed after cooler,changed boots, nothing seems to help getting a little less than 4 mpg and losing 10 to 20 mph on normal hills loaded or empty, is this normal for an e-tech e7 427 ?What year truck and what model? Has the problem just started or has it always been like this? Truck sounds really weak. CH and CX's should get at least 5.2 or better and the dump trucks RD and CV's should get in the mid to high 4's at worst. Quote Link to comment https://www.bigmacktrucks.com/topic/10966-power-and-fuel-mileage/#findComment-41640 Share on other sites More sharing options...
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