Improving my MPG 5.4 V8
02-17-2019, 11:43 AM
#1
Improving my MPG 5.4 V8
Any ideas on how to improve my mpg’s ? I’ve done all the regular preventative maintenance and I don’t hear any bad ticking or miss fires ( assuming it would sound like crap w poor performance and engine lights on, correct ?), just used to get around 15-16 now it’s 12-13. 150k miles and I’ve swapped all the Drive train fluids recently. Should I clean or change the MAF Ssensor ? I don’t have any light or codes showing up either . thanks again
02-17-2019, 12:28 PM
#2
Senior Member
the 5.4's are gas guzzlers as it is. but you are getting worst than average. at 150k miles i have to ask if the spark plugs have ever been replaced? old, worn out plugs can significantly impact gas mileage in a negative way
02-17-2019, 12:43 PM
#3
Yeah, I replaced them with oem ones a few moths back. The first morning i Drive my truck after I swapped them I was getting 16-17, then back down to 12-13 after a few hours .
02-17-2019, 01:26 PM
#4
Mark
iTrader: (1)
02-17-2019, 01:40 PM
#5
Replace air filter, check air pressure, disconnect the battery negative cable for 15 mins to allow the system to reset and go back into learning mode.
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