Ok, I'm getting my STS kit next week and I'm interested as what to expect in the way of fuel mileage. They claim 2-4 MPG better. I'm getting 15-17 now. I'm putting 43# injectors, OBX FMIC and a tune on my 4.8 at the same time, so I can turn up the boost as needed for fun . I'd really like to hear from all you guys running any type FI, especially Parish, FL8, Jerry and the like. I'd like hear what you get crusin, city, highway, towing and even racing... Maybe that would be better quoted in GPM But any how, let hear it!!

 

Cruising= about the same as stock.....Racing= NOPE!!!

 

Crusin I Gained 2 mpg city and hwy. Towing I gained 3-3.5 mpg towing 8500# fifth wheel camper pulling it 70 mph. I think the biggest part of the gain was Allen Nelsons tune. But towing the turbo help gain a good bit. I seems like the more load you put on it the better it performs.

 

Jerry, what kind of mileage where you getting before the turbo?

 

Any one else care to chime in??? I know theres more FI folks around here then this.

 

Cruising around town and getting into slight boost (2psi) sometimes = 17.5 mpg with a 212/218 high lift cam

If you get into higher boost numbers, say 6-10psi, you can almost watch your fuel gauge go down

 

About 12mpg city, 16 hwy, and 11-11.5 towing