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1996 Chevy 305 5.0L Gas mileage

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  • 1996 Chevy 305 5.0L Gas mileage

    I have a 1996 Chevy reg cab stepside with a 305 automatic it is all 100% stock and I have been getting what I think of as horrible gas mileage. I mostly drive around town and short trips on the highway (never more than 30min usually) and I have been getting about 13-14 mpg. I hate this. It feels and looks like a small truck but the mpg doesn't match the looks at all. What can I do to increase my mileage to at least 15mpg and add performance in town? I have heard about a tune and such but money is not limitless so I need the most effective mods as possible. Please help!
    1996 Chevy 1500 RCSBSS 305/4L60E 4x4 - Debadged - 4Hi Headlight Mod - 285 MicThom ATZ+ - Herculiner - Ebay Lights - Color Match Grill

  • #2
    Re: 1996 Chevy 305 5.0L Gas mileage

    13-14mpg isn't horrible city mileage. You should be able to see 15 with a full tune up though.

    We are assuming auto and 2wd? Check your glove for gear ratio RPO too.

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    • #3
      Re: 1996 Chevy 305 5.0L Gas mileage

      No sorry forgot to mention that, K1500 with 126k on the clock.
      1996 Chevy 1500 RCSBSS 305/4L60E 4x4 - Debadged - 4Hi Headlight Mod - 285 MicThom ATZ+ - Herculiner - Ebay Lights - Color Match Grill

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      • #4
        Re: 1996 Chevy 305 5.0L Gas mileage

        Originally posted by maroonchevy305 View Post
        No sorry forgot to mention that, K1500 with 126k on the clock.
        So we are still assuming auto.

        13-14mpg is pretty well the average for city mpg.

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        • #5
          Re: 1996 Chevy 305 5.0L Gas mileage

          Ok well i guess my point in starting this was to get thoughts on ways to increase gas mileage and performance. I have heard good things about tuners but I am wondering which ones are best? (the custom tuners only not the chips and handheld programers) I'm pretty sure I said auto in the first posting too.
          Last edited by maroonchevy305; 06-22-2010, 06:43 PM.
          1996 Chevy 1500 RCSBSS 305/4L60E 4x4 - Debadged - 4Hi Headlight Mod - 285 MicThom ATZ+ - Herculiner - Ebay Lights - Color Match Grill

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          • #6
            Re: 1996 Chevy 305 5.0L Gas mileage

            i hear Blackbear, Nelson, and Wheatley are good tuners..........if u have one local, i would go there if it is a well known reputable tuner that sounds like he knows what hes talkin about.....an im person tune is the best IMO.....thats what i did and its way better than my old hypertech
            2001 ECSB, 4/7 Drop, 265/35/22, 4.8, Built 4L60e, Vig 3200, 4.30, Truetrac, 214/222 EPS Cam, 243 Heads milled .040, NNBS Intake, Tune, Vette Servo, Pacesetter LTs/ORY, CAI, 34" rad, 07+ E-Fans, UD pulley. 334rwhp/311rwtq

            6.0 build in progess
            sigpic

            WRECKED AND SOLD: '97 2DR 2WD Tahoe

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            • #7
              Re: 1996 Chevy 305 5.0L Gas mileage

              My 98 C1500 w/305 auto gets 13-15 in town/short highway. It will pull down 19-20 on long highway trips.
              1998 GMC Sierra SLE 1/2 ton 2WD 305 Vortec
              -Gibson Stainless Cat Back Swept Side
              -255/70 BFG Radial T/A on SS 15's


              :nutkick:

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              • #8
                Re: 1996 Chevy 305 5.0L Gas mileage

                Add intake, headers, true dual exhaust and tune and youll be set. My mileage is pretty good for a fullsize truck.

                1999 OBS GMC Sierra Classic ECSB 2wd-The Show Truck
                1999 OBS GMC Yukon 4dr 2wd-My Daily
                1990 OBS GMC Sierra ST RCSS 2wd-Pops Toy
                1997 OBS Chevy Silverado ECSB 2wd-Pops Daily

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                • #9
                  Re: 1996 Chevy 305 5.0L Gas mileage

                  Originally posted by maroonchevy305 View Post
                  I'm pretty sure I said auto in the first posting too.
                  Missed that. But still never replied with gear ratio, and it makes a huge difference in city driving.

                  FSC tends to prefer blackbear tunes. Do headers, intake, and a proper exhaust (not true duals, unless you x-pipe it and stick to pipe less than 2.5", or do a single 3"), then have it tuned.
                  Last edited by Quyonmob; 06-23-2010, 05:27 AM.

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                  • #10
                    Re: 1996 Chevy 305 5.0L Gas mileage

                    Thanks for all the info. How much do headers affect performance? I have heard Lt's or shorty's are a lot better than stock but I would have a hard time spending $300 for a good pair only to not feel anything too different in performance. I think I will stick with the stock exhaust so I don't have to mess with the O2 sensors and stuff. Anybody know of a tuner in southern MN? haha probabaly not. DroppedAsAChild what kind of gas mileage do you get? Also Quyonmob I looked at my build sticker thingy in the glovebox and on my truck it's all numbers and stuff. Anybody know what gears a 1996 half-ton came with?
                    1996 Chevy 1500 RCSBSS 305/4L60E 4x4 - Debadged - 4Hi Headlight Mod - 285 MicThom ATZ+ - Herculiner - Ebay Lights - Color Match Grill

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                    • #11
                      Re: 1996 Chevy 305 5.0L Gas mileage

                      Look for the gu(x) code. gu6=3.42 gears, gu5=3.23 gears, gu4=3.08 gears. If you dont see any of those, look for gt(x) gt4=3.73, gt5=4.10

                      In terms of gas mileage, a TUNE would be your best bet in terms of a mod to increase mpg. A full tune-up will help as well, (spark plugs, plug wires, distributor cap and rotor, fuel filter, fuel system cleaner (i.e. seafoam, amsoil P.O.), clean air filter, clean MAF sensor, good catalytic converters, clean O2 sensors, PROPERLY INFLATED TIRES, etc...

                      Also, I hear the underdrive pulleys really help with power and fuel economy, as well as an electric fan.
                      Last edited by 98BlueZ71; 06-23-2010, 10:06 AM.
                      1998 Chevy K1500 Z71 ECSB Vortec 350 3.42 G80- Shortys, True Dual 40's, Volant CAI, Blackbear 93 Tune, E-Fan, Jacobs Ignition, Built 4L60E, 500W JL 10" W3 sub w/ Alpine M500 amp, Alpine speakers w/ 300W Infinity 4-channel amp

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                      • #12
                        Re: 1996 Chevy 305 5.0L Gas mileage

                        Thanks ill check on those numbers later today. Why did they change to doing numbersd instead of actually writing what the options were? The truck is perfect mechanical wise and the cap and rotor, spark plugs, and o2 sensors were repalced very recently. What do the underdrive pulleys do exactly? How much do electric fan(s) help too?
                        1996 Chevy 1500 RCSBSS 305/4L60E 4x4 - Debadged - 4Hi Headlight Mod - 285 MicThom ATZ+ - Herculiner - Ebay Lights - Color Match Grill

                        Comment


                        • #13
                          Re: 1996 Chevy 305 5.0L Gas mileage

                          they have always had codes for each option....every code in your glovebox means something.....interior color, gears, power windows, all that stuff has a code
                          2001 ECSB, 4/7 Drop, 265/35/22, 4.8, Built 4L60e, Vig 3200, 4.30, Truetrac, 214/222 EPS Cam, 243 Heads milled .040, NNBS Intake, Tune, Vette Servo, Pacesetter LTs/ORY, CAI, 34" rad, 07+ E-Fans, UD pulley. 334rwhp/311rwtq

                          6.0 build in progess
                          sigpic

                          WRECKED AND SOLD: '97 2DR 2WD Tahoe

                          Comment


                          • #14
                            Re: 1996 Chevy 305 5.0L Gas mileage

                            i know the electric fan helps alot because it doesn't run off the belt drive. This lets the engine rotate much more easily. Under drive pulleys are similar, but instead of eliminating a pulley, like an electric fan does, they just are smaller so that they spin a little easier.
                            My mechanic estimated going from a belt-driven fan to electric will net you about 30hp
                            Last edited by 98BlueZ71; 06-30-2010, 02:17 PM.
                            1998 Chevy K1500 Z71 ECSB Vortec 350 3.42 G80- Shortys, True Dual 40's, Volant CAI, Blackbear 93 Tune, E-Fan, Jacobs Ignition, Built 4L60E, 500W JL 10" W3 sub w/ Alpine M500 amp, Alpine speakers w/ 300W Infinity 4-channel amp

                            Comment


                            • #15
                              Re: 1996 Chevy 305 5.0L Gas mileage

                              i dont know if i would believe it gives 30hp....im thinkin more along the lines of 15....plus the stock fan is plastic, so its not like the motor is trying to spin something heavy

                              but yes E-Fans are definitely worth it, as well as underdrive pulleys
                              Last edited by Low97tahoE; 06-30-2010, 02:49 PM.
                              2001 ECSB, 4/7 Drop, 265/35/22, 4.8, Built 4L60e, Vig 3200, 4.30, Truetrac, 214/222 EPS Cam, 243 Heads milled .040, NNBS Intake, Tune, Vette Servo, Pacesetter LTs/ORY, CAI, 34" rad, 07+ E-Fans, UD pulley. 334rwhp/311rwtq

                              6.0 build in progess
                              sigpic

                              WRECKED AND SOLD: '97 2DR 2WD Tahoe

                              Comment

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