Gas Mileage Question for LO5 Motor... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

TIMSPEED · 06-16-2003, 04:10 AM

What should the LO5 Motor get for gas mileage? We have that motor in our 91 Chevy G20 (3/4 ton Van Conversion), and we're currently getting 15mpg on the freeway. (Cruising @ 75mph the entire time)
We're the original owners and the motor is 100% stock. We haven't changed the O² Sensor, PCV Valve, or EGR Valve yet. Would changing out those three things make a difference? It's got 161k miles on it.
BTW: I know this is in the wrong forum, but I posted in the RIGHT forum, and no one responded, so I figured I'd ask you guys.

apstguy · 06-16-2003, 03:57 PM

With that many miles, the O2 sensor & PCV valve needs to be changed anyways. The O2 sensor can help with a little bit of mileage. It is TBI? If it is, there are several other sensors that need to be changed. Might be the butterfly valve seals (that is what I have heard about TBI engines).

pkbinplano · 06-16-2003, 07:10 PM

My company vehicle is a 99 chevy 1ton van loaded down and get 12 mpg in the city.

*1FaastC10* · 06-16-2003, 09:33 PM

its not the fact taht its an L05 that gives it good gas milage, its the TBI system. if you were to transplant the entire TBI system, then yes, you would get good milage.

06-16-2003, 04:10 AM	#1
TIMSPEED Join Date: Jan 2003 Location: Modesto, CA Posts: 1,321	Gas Mileage Question for LO5 Motor... What should the LO5 Motor get for gas mileage? We have that motor in our 91 Chevy G20 (3/4 ton Van Conversion), and we're currently getting 15mpg on the freeway. (Cruising @ 75mph the entire time) We're the original owners and the motor is 100% stock. We haven't changed the O² Sensor, PCV Valve, or EGR Valve yet. Would changing out those three things make a difference? It's got 161k miles on it. BTW: I know this is in the wrong forum, but I posted in the RIGHT forum, and no one responded, so I figured I'd ask you guys. __________________ I have a few cars... See Them Here

06-16-2003, 03:57 PM	#2
apstguy LED King Join Date: Jan 2003 Location: Sacramento, CA Posts: 2,088	With that many miles, the O2 sensor & PCV valve needs to be changed anyways. The O2 sensor can help with a little bit of mileage. It is TBI? If it is, there are several other sensors that need to be changed. Might be the butterfly valve seals (that is what I have heard about TBI engines). __________________ Tyler 1985 C10 305 w/ Bowtie OD TH700R4 3.42 LSD 202,000 miles 2006 Ford Focus ZX3 5-speed Stick 2016 Chevy Spark EV Gone: 2002.5 VW GTI 24v VR6 Gone: 2008 VW R32

06-16-2003, 07:10 PM	#3
pkbinplano pkbinplano Join Date: Nov 2002 Location: Plano Texas Posts: 370	My company vehicle is a 99 chevy 1ton van loaded down and get 12 mpg in the city. __________________ http://www.picturetrail.com/gallery/...7496&members=1 84 chevy silverado aka The Bananna Boat

06-16-2003, 09:33 PM	#4
1FaastC10 Account Suspended Join Date: Oct 2002 Location: Elkhart, IN Posts: 6,400	its not the fact taht its an L05 that gives it good gas milage, its the TBI system. if you were to transplant the entire TBI system, then yes, you would get good milage.



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