help to complete a Holley Jet calculation using VLOOKUP

[portcity05]

Hi I am need of some help to complete a Holley Jet calculation to determine a Jet change for a given weather condition using ADR (Air Density Ratio) from a Race-air Pro computer.
This is normaly a simple calculation but in this case we have to calculate a Jet change to include a drilled hole (non removeable Jet) and a removable Jet
(1) I need to find a way to extract the fuel flow from a Holley Jet chart.
(2) I need to find a way to extract the correct Jet size from the fuel flow on the chart.
The problem being the chart only contains whole numbers.
For example; The Jet chart reads as per below.
Holley Jet 80 flows 56.2 lb/hr
Holley Jet 81 flows 58.5 lb/hr
I need to get the fuel flow for a 80.6 calculated Jet size, the answer should be 57.6
I can get an answer if I add fuel flow calculations to the Holley Jet chart for every .1 of a Jet size
=VLOOKUP(B17,'Holley Jet Chart'!$A$4:$G$404,6)
But, I still need to return a final Jet size according to the new fuel flow calculation?
Again, the numbers are not whole numbers to find with VLOOKUP
I am hoping a calculation can be added to find and calculate numbers that are not whole numbers?????
I hope I have explained in away that I have not overcomplicated the question and totally confuse you.
regards Terry

Jetting calculation for a Holley carby with an extra hole above the main Jets (Jetting is compensated by changing the removable Jets only)</SPAN>
(1) Enter the Dyno ADR, Jet-A and Jet-B data</SPAN>		Dyno</SPAN>	Main </SPAN>	Fixed</SPAN>
(2) Add the new Race-Air Jet-A and Jet-B to the chart according to the new ADR</SPAN>		ADR</SPAN>	Jet-A</SPAN>	Jet-B</SPAN>
(3) Read the new Jet calculation according to the new ADR (green list)</SPAN>		96.6</SPAN>	80.0</SPAN>	86.0</SPAN>
	Main Jet - removable (A)</SPAN>	Drilling above Main Jet (B)</SPAN>		Main Jet compensated (A+)</SPAN>
Dyno</SPAN>	Main </SPAN>	LB/HR</SPAN>	Flow</SPAN>	Fixed</SPAN>	LB/HR</SPAN>	Flow</SPAN>	Dyno</SPAN>	New Main</SPAN>	LB/HR</SPAN>	Flow</SPAN>
ADR</SPAN>	Jet-A</SPAN>	Flow</SPAN>	difference</SPAN>	Jet-B</SPAN>	Flow</SPAN>	difference</SPAN>	ADR</SPAN>	Jet-A+</SPAN>	Flow</SPAN>	difference</SPAN>
96.6</SPAN>	80.0</SPAN>	56.2</SPAN>		86.0</SPAN>	71.2</SPAN>		96.6</SPAN>	80.0</SPAN>	56.2</SPAN>	Combined</SPAN>
ADR</SPAN>	New Jet</SPAN>	lb's per hour fuel flow</SPAN>	New Jet</SPAN>	lb's per hour fuel flow</SPAN>	ADR</SPAN>	New Jet</SPAN>	lb's per hour fuel flow</SPAN>
Race-Air</SPAN>	Race-Air</SPAN>	jet flow</SPAN>	difference</SPAN>	Race-Air</SPAN>	jet flow</SPAN>	difference</SPAN>	Race-Air</SPAN>	Calculation</SPAN>	jet flow</SPAN>	difference</SPAN>
86</SPAN>	77.4</SPAN>	50.2</SPAN>	-6.0</SPAN>	82.8</SPAN>	63.1</SPAN>	-8.1</SPAN>	86</SPAN>	73.4</SPAN>	42.1</SPAN>	-14.1</SPAN>
87</SPAN>	77.7</SPAN>	50.9</SPAN>	-5.3</SPAN>	83.1</SPAN>	63.8</SPAN>	-7.4</SPAN>	87</SPAN>	74.1</SPAN>	43.5</SPAN>	-12.7</SPAN>
88</SPAN>	77.9</SPAN>	51.4</SPAN>	-4.8</SPAN>	83.4</SPAN>	64.5</SPAN>	-6.7</SPAN>	88</SPAN>	74.7</SPAN>	44.7</SPAN>	-11.5</SPAN>
89</SPAN>	78.2</SPAN>	52.1</SPAN>	-4.1</SPAN>	83.7</SPAN>	65.2</SPAN>	-6.0</SPAN>	89</SPAN>	75.5</SPAN>	46.1</SPAN>	-10.1</SPAN>
90</SPAN>	78.4</SPAN>	52.6</SPAN>	-3.6</SPAN>	84.0</SPAN>	65.9</SPAN>	-5.3</SPAN>	90</SPAN>	76.2</SPAN>	47.3</SPAN>	-8.9</SPAN>
91</SPAN>	78.7</SPAN>	53.4</SPAN>	-2.8</SPAN>	84.3</SPAN>	66.7</SPAN>	-4.5</SPAN>	91</SPAN>	76.9</SPAN>	48.9</SPAN>	-7.3</SPAN>
92</SPAN>	78.9</SPAN>	53.9</SPAN>	-2.3</SPAN>	84.6</SPAN>	67.5</SPAN>	-3.7</SPAN>	92</SPAN>	77.5</SPAN>	50.3</SPAN>	-5.9</SPAN>
93</SPAN>	79.1</SPAN>	54.4</SPAN>	-1.8</SPAN>	84.9</SPAN>	68.3</SPAN>	-2.9</SPAN>	93</SPAN>	78.0</SPAN>	51.5</SPAN>	-4.7</SPAN>
94</SPAN>	79.4</SPAN>	55.0</SPAN>	-1.2</SPAN>	85.2</SPAN>	69.1</SPAN>	-2.1</SPAN>	94</SPAN>	78.5</SPAN>	52.9</SPAN>	-3.3</SPAN>
95</SPAN>	79.6</SPAN>	55.4</SPAN>	-0.8</SPAN>	85.5</SPAN>	69.9</SPAN>	-1.3</SPAN>	95</SPAN>	79.0</SPAN>	54.1</SPAN>	-2.1</SPAN>
96</SPAN>	79.9</SPAN>	56.0</SPAN>	-0.2</SPAN>	85.8</SPAN>	70.7</SPAN>	-0.5</SPAN>	96</SPAN>	79.7</SPAN>	55.5</SPAN>	-0.7</SPAN>
97</SPAN>	80.1</SPAN>	56.4</SPAN>	0.2</SPAN>	86.1</SPAN>	71.5</SPAN>	0.3</SPAN>	97</SPAN>	80.2</SPAN>	56.7</SPAN>	0.5</SPAN>
98</SPAN>	80.3</SPAN>	56.9</SPAN>	0.7</SPAN>	86.4</SPAN>	72.2</SPAN>	1.0</SPAN>	98</SPAN>	80.8</SPAN>	57.9</SPAN>	1.7</SPAN>
99</SPAN>	80.6</SPAN>	57.6</SPAN>	1.4</SPAN>	86.7</SPAN>	73.0</SPAN>	1.8</SPAN>	99</SPAN>	81.4</SPAN>	59.4</SPAN>	3.2</SPAN>
100</SPAN>	80.8</SPAN>	58.0</SPAN>	1.8</SPAN>	87.0</SPAN>	73.8</SPAN>	2.6</SPAN>	100</SPAN>	81.8</SPAN>	60.6</SPAN>	4.4</SPAN>
101</SPAN>	81.1</SPAN>	58.8</SPAN>	2.6</SPAN>	87.3</SPAN>	74.5</SPAN>	3.3</SPAN>	101</SPAN>	82.4</SPAN>	62.1</SPAN>	5.9</SPAN>
102</SPAN>	81.3</SPAN>	59.3</SPAN>	3.1</SPAN>	87.6</SPAN>	75.2</SPAN>	4.0</SPAN>	102</SPAN>	82.9</SPAN>	63.4</SPAN>	7.1</SPAN>
103</SPAN>	81.5</SPAN>	59.9</SPAN>	3.7</SPAN>	87.9</SPAN>	76.0</SPAN>	4.8</SPAN>	103</SPAN>	83.5</SPAN>	64.6</SPAN>	8.4</SPAN>
104</SPAN>	81.8</SPAN>	60.7</SPAN>	4.5</SPAN>	88.2</SPAN>	76.8</SPAN>	5.6</SPAN>	104</SPAN>	84.1</SPAN>	66.2</SPAN>	10.0</SPAN>

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