10 mpg Speed demon

[el-camino]

hi
i run on my elcamino with a 750 VE speed demon.
the car runs great, dyno 330rwhp.
when i read in many forums about consumption, i don´t understand my engine. 10 miles per gallon, i think this is heavy.
the barry grant speed demon have the stock setup:

MODEL #

750V


PART #

1402010VE


VENTURI SIZE:

1.400



IDLE AIR BLEEDS:
.070



H.S. AIR BLEEDS:

.039


BOOSTER TYPE:

DOWN LEG


BOOSTER LEG:

.160


SQUIRTER SIZE:

31 STD.


BUTTERFLY SIZE:

1-11/16


AIR HOLE SIZE:

NONE


PUMP CAM #

# 330


PUMP CAM COLOR:

PINK


VACUUM SEC. SPRING:N/AYELLOWPLAINPLAINPLAINMETERING BLOCK # P.

A-12400


METERING BLOCK # S.

A-12402


SIPHON BREAK:

.028


E-HOLE POS. #1

.031


E-HOLE POS. #2

N/A


E-HOLE POS. #3

.031


E-HOLE POS. #4

N/A


E-HOLE POS. #5

.031


P.V.C.R. SIZE:

.059


TRANSFER SLOT RES:

OPEN


IDLE FEED RESTRICTOR

.033


MAIN JETS PRI:

# 76


MAIN JETS SEC:

# 83


POWER VALVE PRI:

6.5 STD.


POWER VALVE SEC:

N/A


LINKAGE TYPE:

VACUUM


N&S SIZE/TYPE:

.110-VITON


ACC. PUMP DIA. SIZE

30CC



any idea what i can change or set up ?

[chicane67]

What is your maximum idle vacuum ??

What is your cruise vacuum ??

What do your plugs look like (and what are you running for plugs) ??

Does your linkage close all the way and do you actually get WOT ??

What type of air cleaner are you using ??

Do you run a carb spacer and if you do what type ??

What transmission do you run and if its an auto what is the stall/flash rpm and type ??

[el-camino]

hi,
tomorrow i check diectly the vacuum

plugs AC Delco R44TS

linkage works perfect and WOT

aircleaner
https://static1.pt-content.com/images/pt/2006/06/20060514_11-1.jpg

no spacer

TH350 TCI streetfighter with saturday night special converter

http://www.tciauto.com/converters/index.htm

[Tech @ BG]

Have you done any tuning on the engine yet?

[6'9"Witha69]

Check your ignition advance as well.

[DusterRT]

Is your speedometer correct? How many tanks have you gone through to get your figures, and how are you driving; like highway only, in town only, hard, easy, etc.