5.7 Mileage

[98BLACKBURB]

I have a 98 K1500 Suburban,I played with this and that and am currently getting 15.3 in town ,have'nt been on a road trip yet.What is your 350 getting?

[bob002500]

i have a 2000 2500 with the 5.7 im running 315 and a 5spd and im getting about 12.5 in town and about 15.5 to 16 on the highway. ive got exhaust and a hypertech programer

[Wingnut]

I get about 15 out of my TBI 350.

[PFUND28]

about 17 mix..... with 265's no other mods...

[05W/T]

1997 GMC 1500 ECSB 350 Auto 208,000 miles 3.42 gears 255/70-15

17-19mpg normal

14-15mpg winter

21mpg long trip

 

no real city driving

 

05 W/T

[pknowles]

97 2500 5.7L w/4L80E 3.73's

 

13 city

18-19 highway

[nhproxr]

'98 Yukon, 350 vortec, 3.42 gears and 265/16s. If I'm gentle with it I get about 15.3 mpg. If I just get in and drive more like 13 to 14.

 

Truck has 142,000+ miles now though, so I guess I'm doing alright considering I have never touch tranny, any major engine components, injectors, O2 sensors, nothing. Just been changing filters, adding gas and oil and going.

 

Honestly don't see how some of you guys are approaching 20 miles per gallon with a 350.

 

Show/tell me how I'd like to be getting that.

[05W/T]

My 1997 ECSB was 2WD which probably helps. While I owned it I added dual exhaust w/ Flowmaster Super 40s, K&N filter, Bosch 2s, Taylor wires, and VR velocity stack. Other than better sound none of them made a difference in mileage. I bought it w/ 192,000 miles on it and the day after I bought it until I sold it the check engine light was on w/ code P0440 which is low effecency cat.

 

Brian

05 W/T 4.3 5-speed

[intruder217]

99 Suburban 5.7L Vortec, 3.42 rear, 255/70/16's, 156,000 miles, latest was 15.7 mpg combined city and highway.