What kind of gas milage do you guys get? I have a manual 2.8 V6 and I get 12-15. This seems really low for a V6. I was also told I have a bad diverter valve that could be causing it. Is this milage normal and does anyone know if this diverter valve thing could be causing bad milage?

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173 2.8L V6
Flowmaster Muffler
The rest stock.

It an automatic as low as 18MPG as high at 23MPG

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90 Firebird SSA (Bone stock 3.1)

Everything Below I've added

Engine: Accel Super Coil, 8mm Accel Ignition Wires, 170 Degree Thermostat, NKG Plautum Plugs, K&N Filter, Flowmaster 80

Suspension: Bell Tech Drop Spindles, Edelbrock PanHard Bar, Lakewood Lower Control Arms, Wonderbar IROC-Z, KYB GR2 Struts, KYB Gas-a-Just Shocks, PST Suspension Polygrapite Bushings All Round, 36mm WS6 Front Sway Bar, 24mm WS6 Rear Sway Bar

Brakes: Cross Drilled and sloted Rotors

Appearance: Trans Am Tail Lights, Trans Am Wrap Around Wing, Trans Am 16" Alum rims, Tinted Windows Rear 90% Sides 50%

Interior: GTA power seats, Overhead console, Power windows, Power locks, T-tops, Sun shade, Pioneer P77DH, Uniden radar detector, Intellitronix - Fuel pressure gauge, Transmission temp gauge. (In pods)

i have the same crappy gas mileage too. 86 2.8

I average 22 on the highway and have gotten as high as 27 before, but as low as 17 or so.

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Red 1986 SC, 2.8L, rebuilt 700R4, 3.42 Posi, t-tops, 138K miles and counting, K&N air filters w/ removed air baffles, hopefully more to come!
RIP #3

Does anyone know about this diverter valve?

i average 8-9 in city and 16 on highway. Damn stoplights

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" I'd rather run last in a full out race, than to NOT run at all ".

graeme, i've secretly been driving to northridge and syphoning 7 gallons of gas out of your car every week. this explains your horrific gas mileage.

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Dan
1990 3.1L RS
80 Series Flowmaster
It's fast(er than a 3 cyl metro)

lol thats about right! i get 120 miles on a full tank...