Conversions & Swaps LSX Engines in Non-LSX Vehicles
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Old Jul 1, 2014 | 05:42 PM
  #21  
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Originally Posted by llorracs93s10
Not what I wanted to read, lol. I have a l92 with a cam long tubes 3 inch exhaust with 4.10s through a 4l80e and 28.3 inch tires and was hoping for decent mileage, lol.
Hey Justin,
I've only got 1250 miles on mine since the swap. Hoping for improvement here.
I'd be shocked to see more than 24 on the freeway, though. I guess we shall see. Shocked to hear of some getting high twenties, though that is great.

Doug
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Old Jul 3, 2014 | 08:43 AM
  #22  
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1985 el camino Lq4 6.0l 4l60e 3.73 gear with 26 inch tires. I get 15 to 16 city and 17 to 20 on the highway running 2000 to 3000 rpm. I spin 2000 at 55 and 2500 at 70. My driving style probably has something to do with it. I know someone who had a 78 buick Electra 5.3l th400 27 inch tires with a 3.08 gear and was getting 26 on the highway. Far tires and a 4l80e brought it down to 20mpg
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Old Jul 23, 2014 | 06:50 PM
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1989 S10 Blazer, roughly 3100 lbs, 2005 LQ4, LS1 intake, Comp Cams XFI RPM cam 224,228 duratrion @ .050 with .534, .537 lift, shift point set at 6300 rpm, 2004 4L80 with stock converter (1800 lock), 4:10 gears and 25" tall tires. Average 15-19 mpg city and highway (I have a heavy foot), spins around 2500 at 60 mph and 3200 at 80 mph
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Old Jul 23, 2014 | 10:47 PM
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Originally Posted by goodwrenchbutch
1989 Trans am GTA 6.0/4l60e. small comp cam(530 lift), 3600 yank stall, 3.73 and 245-55-16 that has not been dyno tuned. I average 20 mpgs driving two lanes to work, 24mpgs on the interstate. it doesn't matter if I run 65 or 80 on the interstate, at 80 mph my cars is running 2800 rpm. These engines like to breathe.
Hey, thanks for posting that, I've been a bit curious as to what I could expect from my combo, & yours is fairly similar (with the exception of the transmission of course). My signature used to have a blurb in it that read "Hoping for 450 hp and 30 mpg!" - but, given the weight of the car (even though I've done a fair bit to lighten it), I'm thinking that 27 is probably a lot more realistic.

Ah well - I'm a lot more interested in GPM (grins per mile) than MPGs anyway...
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Old Jul 24, 2014 | 09:50 AM
  #25  
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From: Simi VAlley,CA
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I averaged 26 mpg on my Route 66 tour a couple years ago but I took the 3.70 gears out for that trip and installed 3.25 gears. The interesting thing is that after putting the 3.70 gears back in the car only lost maybe 1 mpg. The car is just "happy" with the 3.70 gears. I will see how my Victor Jr upgrade effects economy as soon as I complete it.
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Old Jul 24, 2014 | 11:42 AM
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bone stock gen 3 5.3/4l60e in a '66 c10 with a 3"/4" drop and 3.73 gears on 255/60 17's

gets about 14 in town and 21 on the freeway at 60mph turning ~1700rpm. That's if I'm chill on the loud pedal.

I played a bunch with the dfco to get those numbers. These trucks are just not very aero at all. I might mess around with OLSD next long trip I take and see if I can lean it out.
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