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On the swaps Ive done which are typically cam, intake, exhaust, tune 5.3's, mileage is typically about 20 street 28 freeway. First the new Camaros are over 2 tons so youre gonna see a boost with even a heavy A body. Second, is the car you were driving a manual or auto. The auto gets DOD so cruising mileage goes up a bit from only running on 4 cylinders. Third, when you bump the efficiency of the motor with upgrades and tune it for a better fuel curve youre also gonna see a nice bump in mileage.

I can think of an engine swap out there that can beat the LSx for price, power, durabilty, economy and the big one EASE OF SWAPPING IT. The last reason alone is why almost every RWD platform in the world has a kit for swapping this motor into it. BMW, Porsche, Nissan/Datsun/Infinity, FORD lol, Jag and the list goes on. Its so good youre stupid not to swap it in if an EFI swap is being considered.

I am a die hard LSx enthusiast and will be until a massive architectural change is made that destroys the upsides that are here now. Direct injection may be one of those problematic upgrades for tuners and Its coming soon. As good as DI is the software isnt there to tune it right now and therefore will put off a lot of guys like us even though the bump in power and economy will be there.

Hope that is a convincing monologue regarding the pros and almost no cons of the engine.
You seem to really know what youre talking about so which LS would you say gets the best mpg(and which can be tuned for the best mpg) would it be the LS1, or maybe LS4? power isnt a concern to me. i have been driving a toyota pickup with 110 hp and 140tq so anything over 180hp is fine with me; my main concern with a LS is mileage. I need to get whichever LS will save me the most gas. Also im planning on putting it in a RWD vehicle, I heard the LS4 is hard to put in an el camino, could you touch on that too if the LS4 gets the best mpg?

thank you very much - Judah
 

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You seem to really know what youre talking about so which LS would you say gets the best mpg(and which can be tuned for the best mpg) would it be the LS1, or maybe LS4? power isnt a concern to me. i have been driving a toyota pickup with 110 hp and 140tq so anything over 180hp is fine with me; my main concern with a LS is mileage. I need to get whichever LS will save me the most gas. Also im planning on putting it in a RWD vehicle, I heard the LS4 is hard to put in an el camino, could you touch on that too if the LS4 gets the best mpg?

thank you very much - Judah
10 year old thread. Just FYI
 

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My 5.3 liter LS "LM7" Gen 3 motor out of a 1999 GMC Sierra with a 4L60E transmission and 2.73 gears in the differential gets around 25 MPG on the highway.

And I'm probably averaging 18-20 overall combined in town and highway on an unmolested, stock, never been rebuilt engine with 156,000 or so miles.

I suppose you could improve on that slightly with a same vintage 4.8 liter LS motor.

The only improvements I've made to this motor have all been external - a set of Holley Hooker Blackheart headers. Also the Holley forward bias engine mounts and the Holley 302-2 oil pan.

Rick

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Im aware. i just dont know how to post a question and hoping somebody could help me out instead of just saying stuff i already know
Judah, you could start a new thread up in LS swap forum. WELCOME to Team Chevelle btw!

PS, I would hope for well over 20+ mpg being computer controlled and 5-6 forward gears/OD and all. Am intrigued most by the recent version with variable cam timing and STUPID TQ and HP relationship.
 

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1970 SS454 LS6 11 second street car
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I drive a Trailblazer SS daily. Has the 400 HP 6.0 LS2. Truck is 100% stock
4.10 gear/4L65E trans,4800 lbs. and AWD not the best recipe for mileage.
I average 11.9 MPG combined highway and city driving. I do have a heavy foot.
Not very impressive MPG in my book. But its a hoot to drive.
 
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